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<h3>
Ben Gamari pushed to branch wip/with2-primop
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4fd166ae587683e51f022c0d2657955b05023f28">4fd166ae</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-04-19T04:50:47+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CorePrep: Admit nested runRW# applications
We can then end up with applications of the form
runRW# (\s s' -> ...) s''
Which have a higher apparent arity than CorePrep previously expected for
runRW#.
TODO: Do same for keepAlive#
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88a9a43b6a9d5c17f239fd13e72aa01937d7fade">88a9a43b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-19T15:09:24+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SetLevels: Don't float out of runRW# and keepAlive# apps
</pre>
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<h4>2 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#de7d9d388885ce6e3a45a39fac6e2c36a7f94f69">
compiler/GHC/Core/Op/SetLevels.hs
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<li class="file-stats">
<a href="#a5d27de4e3111a69f69902c65ecf7b3379f7c49a">
compiler/GHC/CoreToStg/Prep.hs
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<h4>Changes:</h4>
<li id="de7d9d388885ce6e3a45a39fac6e2c36a7f94f69">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ae6dae6a6c4d668c2639764bee1e0bbf42c646d1...88a9a43b6a9d5c17f239fd13e72aa01937d7fade#de7d9d388885ce6e3a45a39fac6e2c36a7f94f69"><strong>compiler/GHC/Core/Op/SetLevels.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">@@ -91,10 +91,12 @@ import GHC.Types.Demand ( StrictSig, Demand, isStrictDmd, splitStrictSig,</td>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Cpr</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mkCprSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">botCpr</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">getOccName</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkSystemVarName</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Occurrence</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">occNameString</span> <span class="p">)</span></span>
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94
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<pre style="margin: 0;">+<span id="LC94" 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="nf" style="color: #900; font-weight: 600;">hasKey</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkLamTypes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitTyConApp_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfType</span></span>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mightBeUnliftedType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">closeOverKindsDSet</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RecFlag</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">isRec</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.DataCon</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">dataConOrigResTy</span> <span class="p">)</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">PrelNames</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">runRWKey</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">keepAliveIdKey</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TysWiredIn</span></span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.Supply</span></span>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Util</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="399" 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="401" 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">@@ -399,8 +401,12 @@ lvlNonTailExpr env expr</td>
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399
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401
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<pre style="margin: 0;"> <span id="LC401" class="line" lang="haskell"><span class="n" style="color: #333;">lvlApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LevelEnv</span></span>
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExprWithFVs</span></span>
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401
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<pre style="margin: 0;"> <span id="LC403" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoreExprWithFVs</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreExprWithFVs</span><span class="p">])</span> <span class="c1" style="color: #998; font-style: italic;">-- Input application</span></span>
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402
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<pre style="margin: 0;">-<span id="LC402" class="line" lang="haskell"> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LvlM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">LevelledExpr</span></span> <span class="c1" style="color: #998; font-style: italic;">-- Result expression</span></span>
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<pre style="margin: 0;">+<span id="LC404" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LvlM</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LevelledExpr</span></span><span class="idiff right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- Result expression</span></span>
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<pre style="margin: 0;"> <span id="LC405" class="line" lang="haskell"><span class="n" style="color: #333;">lvlApp</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">orig_expr</span> <span class="p">((</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">AnnVar</span> <span class="n" style="color: #333;">fn</span><span class="p">),</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC406" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">fn</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 class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">fn</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">keepAliveIdKey</span></span>
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<pre style="margin: 0;">+<span id="LC407" 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;">args'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">lvlExpr</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC408" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">foldl'</span> <span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="p">(</span><span class="n" style="color: #333;">lookupVar</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">fn</span><span class="p">)</span> <span class="n" style="color: #333;">args'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">floatOverSat</span> <span class="n" style="color: #333;">env</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Floating over-saturated applications]</span></span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">n_val_args</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ae6dae6a6c4d668c2639764bee1e0bbf42c646d1...88a9a43b6a9d5c17f239fd13e72aa01937d7fade#a5d27de4e3111a69f69902c65ecf7b3379f7c49a"><strong>compiler/GHC/CoreToStg/Prep.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">@@ -847,14 +847,18 @@ cpeApp top_env expr</td>
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- rather than the far superior "f x y". Test case is par01.</span></span>
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">terminal</span><span class="p">,</span> <span class="n" style="color: #333;">args'</span><span class="p">,</span> <span class="n" style="color: #333;">depth'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">collect_args</span> <span class="n" style="color: #333;">arg</span></span>
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">cpe_app</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">terminal</span> <span class="p">(</span><span class="n" style="color: #333;">args'</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">depth</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">depth'</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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<pre style="margin: 0;">-<span id="LC850" class="line" lang="haskell"> <span class="n" style="color: #333;">cpe_app</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="p"><span class="idiff left">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CpeApp</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_runtimeRep</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Type</span></span><span class="p"><span class="idiff">{},</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CpeApp</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_type</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Type</span></span><span class="p"><span class="idiff">{},</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CpeApp</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arg</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff right">1</span></span></span>
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"> <span class="n" style="color: #333;">cpe_app</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CpeApp</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_runtimeRep</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Type</span></span><span class="p"><span class="idiff">{}</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CpeApp</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_type</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Type</span></span><span class="p"><span class="idiff">{}</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CpeApp</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arg</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">rest</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">n</span></span></span>
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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">f</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">runRWKey</span></span>
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<pre style="margin: 0;">+<span id="LC852" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- N.B. While it may appear that n == 1 in the case of runRW#</span></span>
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<pre style="margin: 0;">+<span id="LC853" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- applications, keep in mind that we may have applications that return</span></span>
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"> <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>
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855
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<pre style="margin: 0;"> <span id="LC855" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [runRW magic]</span></span>
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Replace (runRW# f) by (f realWorld#), beta reducing if possible (this</span></span>
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854
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857
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is why we return a CorePrepEnv as well)</span></span>
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858
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<pre style="margin: 0;"> <span id="LC858" 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;">arg</span> <span class="kr" style="font-weight: 600;">of</span></span>
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856
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<pre style="margin: 0;">-<span id="LC856" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">cpe_app</span> <span class="p">(</span><span class="n" style="color: #333;">extendCorePrepEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">realWorldPrimId</span><span class="p">)</span> <span class="n" style="color: #333;">body</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="mi" style="color: #099;">0</span></span>
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857
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<pre style="margin: 0;">-<span id="LC857" 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;">cpe_app</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">arg</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CpeApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">realWorldPrimId</span><span class="p">)]</span> <span class="mi" style="color: #099;">1</span></span>
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859
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">cpe_app</span> <span class="p">(</span><span class="n" style="color: #333;">extendCorePrepEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">realWorldPrimId</span><span class="p">)</span> <span class="n" style="color: #333;">body</span> <span class="n" style="color: #333;">rest</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;">2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC860" 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;">cpe_app</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">arg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CpeApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">realWorldPrimId</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest</span><span class="p">)</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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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: What about casts?</span></span>
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862
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"></span>
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859
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863
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<pre style="margin: 0;"> <span id="LC863" class="line" lang="haskell"> <span class="n" style="color: #333;">cpe_app</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">n</span></span>
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860
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864
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">f</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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