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<h3>

Andreas Klebinger pushed to branch wip/andreask/elem_rule_fix

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/c9e7c782bc1414f960d1116267c683da28f961df">c9e7c782</a></strong>

<div>

<span>by Andreas Klebinger</span>

<i>at 2020-04-14T02:46:45+02:00</i>

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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update comments/notes

Also use eqExpr for match_append_lit.

</pre>

</li>

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<h4>2 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#7685262a8a145335ec922d0a92ebb4a789bf0a3e">

compiler/GHC/Core/Op/ConstantFold.hs

</a>

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<li class="file-stats">

<a href="#5550456b4c18a3437d117712bc1421c71cca5d98">

libraries/ghc-prim/GHC/CString.hs

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<h4>Changes:</h4>

<li id="7685262a8a145335ec922d0a92ebb4a789bf0a3e">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c9e7c782bc1414f960d1116267c683da28f961df#7685262a8a145335ec922d0a92ebb4a789bf0a3e"><strong>compiler/GHC/Core/Op/ConstantFold.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="36" 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="36" 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">@@ -36,6 +36,7 @@ import GHC.Types.Id</td>

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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Literal</span></span>

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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.SimpleOpt</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">exprIsLiteral_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprIsLambda_maybe</span></span>

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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell">                          <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprIsStrippableLiteral_maybe</span> <span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FVs</span></span>

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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">PrimOp</span>             <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">PrimOp</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;">tagToEnumKey</span> <span class="p">)</span></span>

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<td class="diff-line-num new_line" data-linenumber="41" 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">

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<pre style="margin: 0;"> <span id="LC41" 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="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TysPrim</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="44" 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="45" 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">@@ -44,7 +45,7 @@ import GHC.Core.TyCon</td>

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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell">   <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNewTyCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unwrapNewTyCon_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyConDataCons</span></span>

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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell">   <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyConFamilySize</span> <span class="p">)</span></span>

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<td class="diff-line-num new_line" data-linenumber="47" 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">

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<pre style="margin: 0;"> <span id="LC47" 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;">dataConTagZ</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dataConTyCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dataConWrapId</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dataConWorkId</span> <span class="p">)</span></span>

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<pre style="margin: 0;">-<span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span>  <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">cheapEqExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cheapEqExpr'</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprIsHNF</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprType</span></span>

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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span>  <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">eqExpr</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">cheapEqExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cheapEqExpr'</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprIsHNF</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprType</span></span>

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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell">                       <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">stripTicksTop</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">stripTicksTopT</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTicks</span> <span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Unfold</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">exprIsConApp_maybe</span> <span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="69" 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="70" 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">@@ -69,7 +70,8 @@ import Data.Int</td>

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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Ratio</span></span>

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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Word</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"></span>

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<td class="diff-line-num new_line old" data-linenumber="73" 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="LC72" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="75" 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">

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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="74" 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">

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<td class="diff-line-num new_line" data-linenumber="76" 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">

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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Constant folding]</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="77" 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">

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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1467" 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="1469" 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">@@ -1467,11 +1469,20 @@ match_append_lit foldVariant _ id_unf _</td>

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<pre style="margin: 0;"> <span id="LC1469" class="line" lang="haskell">                        <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">App</span><span class="p">`</span> <span class="n" style="color: #333;">c2</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1470" class="line" lang="haskell">                        <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">App</span><span class="p">`</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">stripTicksTop</span> <span class="n" style="color: #333;">tickishFloatable</span> <span class="n" style="color: #333;">e2</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="1471" 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">

1471

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<pre style="margin: 0;"> <span id="LC1471" class="line" lang="haskell">  <span class="p">,</span> <span class="n" style="color: #333;">unpk</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">foldVariant</span></span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="1472" 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="LC1470" class="line" lang="haskell">  <span class="p">,</span> <span class="n" style="color: #333;">cheapEqExpr'</span> <span class="n" style="color: #333;">tickishFloatable</span> <span class="n" style="color: #333;">c1</span> <span class="n" style="color: #333;">c2</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1471" 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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<td class="diff-line-num new_line old" data-linenumber="1472" 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="LC1471" class="line" lang="haskell">  <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">c1Ticks</span><span class="p">,</span> <span class="n" style="color: #333;">c1'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">stripTicksTop</span> <span class="n" style="color: #333;">tickishFloatable</span> <span class="n" style="color: #333;">c1</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1472" 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="LC1472" class="line" lang="haskell">  <span class="p">,</span> <span class="n" style="color: #333;">c2Ticks</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">stripTicksTopT</span> <span class="n" style="color: #333;">tickishFloatable</span> <span class="n" style="color: #333;">c2</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC1472" class="line" lang="haskell">  <span class="p">,</span> <span class="n" style="color: #333;">pprTrace</span> <span class="s" style="color: #d14;">"match_append_lit"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span>         <span class="p">[</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">ty1</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1473" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1473

</td>

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<pre style="margin: 0;">+<span id="LC1473" class="line" lang="haskell">        <span class="p">,</span> <span class="n" style="color: #333;">lit1</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1473" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1474" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1474

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<pre style="margin: 0;">+<span id="LC1474" class="line" lang="haskell">        <span class="p">,</span> <span class="n" style="color: #333;">c1</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1473" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1475" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1475

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<pre style="margin: 0;">+<span id="LC1475" class="line" lang="haskell">        <span class="p">,</span> <span class="n" style="color: #333;">e2</span></span>

</pre>

</td>

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<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1473" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1476" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1476

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<pre style="margin: 0;">+<span id="LC1476" class="line" lang="haskell">        <span class="p">])</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1473" 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">

1473

</td>

<td class="diff-line-num new_line" data-linenumber="1477" 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">

1477

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<pre style="margin: 0;"> <span id="LC1477" class="line" lang="haskell">  <span class="p">,</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;">LitString</span> <span class="n" style="color: #333;">s1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">exprIsLiteral_maybe</span> <span class="n" style="color: #333;">id_unf</span> <span class="n" style="color: #333;">lit1</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1474" 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">

1474

</td>

<td class="diff-line-num new_line" data-linenumber="1478" 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">

1478

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<pre style="margin: 0;"> <span id="LC1478" class="line" lang="haskell">  <span class="p">,</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;">LitString</span> <span class="n" style="color: #333;">s2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">exprIsLiteral_maybe</span> <span class="n" style="color: #333;">id_unf</span> <span class="n" style="color: #333;">lit2</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1475" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1479" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1479

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<pre style="margin: 0;">+<span id="LC1479" class="line" lang="haskell">  <span class="p">,</span> <span class="n" style="color: #333;">pprTraceIt</span> <span class="s" style="color: #d14;">"eqExpr"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">eqExpr</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1475" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1480" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1480

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<pre style="margin: 0;">+<span id="LC1480" class="line" lang="haskell">      <span class="p">(</span><span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">exprFreeVars</span> <span class="n" style="color: #333;">c1</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">exprFreeVars</span> <span class="n" style="color: #333;">c2</span><span class="p">))</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1475" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1481" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1481

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<pre style="margin: 0;">+<span id="LC1481" class="line" lang="haskell">      <span class="n" style="color: #333;">c1</span> <span class="n" style="color: #333;">c2</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1475" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1482" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1482

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<pre style="margin: 0;">+<span id="LC1482" class="line" lang="haskell">  <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">c1Ticks</span><span class="p">,</span> <span class="n" style="color: #333;">c1'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">stripTicksTop</span> <span class="n" style="color: #333;">tickishFloatable</span> <span class="n" style="color: #333;">c1</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1475" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1483" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1483

</td>

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<pre style="margin: 0;">+<span id="LC1483" class="line" lang="haskell">  <span class="p">,</span> <span class="n" style="color: #333;">c2Ticks</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">stripTicksTopT</span> <span class="n" style="color: #333;">tickishFloatable</span> <span class="n" style="color: #333;">c2</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1475" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1484" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1484

</td>

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<pre style="margin: 0;">+<span id="LC1484" class="line" lang="haskell">  <span class="p">,</span> <span class="n" style="color: #333;">pprTrace</span> <span class="s" style="color: #d14;">"areLits?"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">c2Ticks</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>

</pre>

</td>

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<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1475" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1485" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1485

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1485" class="line" lang="haskell">  <span class="p">,</span> <span class="n" style="color: #333;">pprTrace</span> <span class="s" style="color: #d14;">"Matched!"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">show</span> <span class="o" style="font-weight: 600;">$</span> <span class="p">(</span><span class="n" style="color: #333;">s1</span><span class="p">,</span><span class="n" style="color: #333;">s2</span><span class="p">))</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1475" 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">

1475

</td>

<td class="diff-line-num new_line" data-linenumber="1486" 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">

1486

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1486" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">ty1</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">ty2</span> <span class="p">)</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1476" 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">

1476

</td>

<td class="diff-line-num new_line" data-linenumber="1487" 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">

1487

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1487" class="line" lang="haskell">    <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkTicks</span> <span class="n" style="color: #333;">strTicks</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1477" 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">

1477

</td>

<td class="diff-line-num new_line" data-linenumber="1488" 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">

1488

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1488" class="line" lang="haskell">         <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">unpk</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">App</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="n" style="color: #333;">ty1</span></span>

</pre>

</td>

</tr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1492" 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="1503" 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">@@ -1492,6 +1503,9 @@ match_eq_string _ id_unf _</td>

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<td class="diff-line-num old_line" data-linenumber="1492" 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">

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<pre style="margin: 0;"> <span id="LC1503" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">unpk_key1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getUnique</span> <span class="n" style="color: #333;">unpk1</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1504" class="line" lang="haskell">  <span class="p">,</span> <span class="n" style="color: #333;">unpk_key2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getUnique</span> <span class="n" style="color: #333;">unpk2</span></span>

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<td class="diff-line-num old_line" data-linenumber="1494" 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">

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<td class="diff-line-num new_line" data-linenumber="1505" 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">

1505

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<pre style="margin: 0;"> <span id="LC1505" class="line" lang="haskell">  <span class="p">,</span> <span class="n" style="color: #333;">unpk_key1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">unpk_key2</span></span>

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<td class="diff-line-num new old_line" data-linenumber="1495" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="1506" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC1506" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- For now we insist the literals have to agree in their encoding</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1495" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="1507" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC1507" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- to keep the rule simple. But we could check if the decoded strings</span></span>

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<td class="diff-line-num new old_line" data-linenumber="1495" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="1508" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1508

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<pre style="margin: 0;">+<span id="LC1508" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- compare equal in here as well.</span></span>

</pre>

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1495

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<td class="diff-line-num new_line" data-linenumber="1509" 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">

1509

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<pre style="margin: 0;"> <span id="LC1509" class="line" lang="haskell">  <span class="p">,</span> <span class="n" style="color: #333;">unpk_key1</span> <span class="p">`</span><span class="n" style="color: #333;">elem</span><span class="p">`</span> <span class="p">[</span><span class="n" style="color: #333;">unpackCStringUtf8IdKey</span><span class="p">,</span> <span class="n" style="color: #333;">unpackCStringIdKey</span><span class="p">]</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1496" 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">

1496

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<td class="diff-line-num new_line" data-linenumber="1510" 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">

1510

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<pre style="margin: 0;"> <span id="LC1510" class="line" lang="haskell">  <span class="p">,</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;">LitString</span> <span class="n" style="color: #333;">s1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">exprIsLiteral_maybe</span> <span class="n" style="color: #333;">id_unf</span> <span class="n" style="color: #333;">lit1</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="1511" 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">

1511

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<pre style="margin: 0;"> <span id="LC1511" class="line" lang="haskell">  <span class="p">,</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;">LitString</span> <span class="n" style="color: #333;">s2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">exprIsLiteral_maybe</span> <span class="n" style="color: #333;">id_unf</span> <span class="n" style="color: #333;">lit2</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1506" 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="1520" 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">@@ -1506,30 +1520,39 @@ We start of with this userwritten code in haskell</td>

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<td class="diff-line-num old_line" data-linenumber="1506" 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">

1506

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<td class="diff-line-num new_line" data-linenumber="1520" 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">

1520

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<pre style="margin: 0;"> <span id="LC1520" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1507" 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">

1507

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<td class="diff-line-num new_line" data-linenumber="1521" 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">

1521

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<pre style="margin: 0;"> <span id="LC1521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    elem x "<knownString>"</span></span>

</pre>

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1508

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<td class="diff-line-num new_line" data-linenumber="1522" 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">

1522

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<pre style="margin: 0;"> <span id="LC1522" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1509" 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">

1509

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<td class="diff-line-num new_line old" data-linenumber="1523" 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="LC1509" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which we would like to transform into:</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1510" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="1523" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC1523" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">After optimization we would like the resul</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1510" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="1524" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1524

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<pre style="margin: 0;">+<span id="LC1524" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1510" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="1525" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC1525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which we would like to transform this into an</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1526" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC1526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expression semantically equivalent to:</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1510" 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">

1510

</td>

<td class="diff-line-num new_line" data-linenumber="1527" 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">

1527

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1527" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1511" 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">

1511

</td>

<td class="diff-line-num new_line" data-linenumber="1528" 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">

1528

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    case x of</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1529" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1529

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        '<' -> True</span></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1512" 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">

1512

</td>

<td class="diff-line-num new_line" data-linenumber="1530" 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">

1530

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        'k' -> True</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1513" 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">

1513

</td>

<td class="diff-line-num new_line old" data-linenumber="1531" 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">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1513" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        'k' -> True</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1514" 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">

1514

</td>

<td class="diff-line-num new_line old" data-linenumber="1531" 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">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1514" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        '_' -> True</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1515" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1531" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1531

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        'n' -> True</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1515" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1532" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1532

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        'o' -> True</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1515" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1533" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1533

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        ...</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1515" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1534" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1534

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        '>' -> True</span></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1515" 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">

1515

</td>

<td class="diff-line-num new_line" data-linenumber="1535" 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">

1535

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1535" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1516" 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">

1516

</td>

<td class="diff-line-num new_line old" data-linenumber="1536" 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">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For lists this would happen automatically via rules</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1517" 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">

1517

</td>

<td class="diff-line-num new_line old" data-linenumber="1536" 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">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1517" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">associated with elem. However these do not fire for</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1518" 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">

1518

</td>

<td class="diff-line-num new_line old" data-linenumber="1536" 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">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1518" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">string literals as we do not translate string literals</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1519" 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">

1519

</td>

<td class="diff-line-num new_line old" data-linenumber="1536" 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">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1519" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">into actual lists for performance reasons. (At least</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1520" 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">

1520

</td>

<td class="diff-line-num new_line old" data-linenumber="1536" 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">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1520" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">past a certain string size)</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1521" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1536" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1536

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is then either compiled to a binary search or a lookup table, so at</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1521" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1537" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1537

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">worst log(n) in complexity.</span></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1521" 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">

1521

</td>

<td class="diff-line-num new_line" data-linenumber="1538" 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">

1538

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1538" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1522" 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">

1522

</td>

<td class="diff-line-num new_line old" data-linenumber="1539" 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">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1522" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For string literals what happens in abensence of any</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1523" 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">

1523

</td>

<td class="diff-line-num new_line old" data-linenumber="1539" 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">

</td>

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<pre style="margin: 0;">-<span id="LC1523" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">built in rules what would happen is:</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1524" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1539" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1539

</td>

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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For proper lists this happens via rules</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1524" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1540" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1540

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">associated with elem (elem/build). However these do not achieve the same</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1524" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1541" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1541

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">outcome when operating over string literals because we do not desugar them</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1524" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1542" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1542

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to actual lists. See Note [String literals in GHC] for how strings are</span></span>

</pre>

</td>

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<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1524" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1543" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1543

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">desugared in general.</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1524" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1544" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1544

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1544" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1524" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1545" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1545

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For elem on string literals what would happen would be:</span></span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1524" 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">

1524

</td>

<td class="diff-line-num new_line" data-linenumber="1546" 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">

1546

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1546" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1525" 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">

1525

</td>

<td class="diff-line-num new_line" data-linenumber="1547" 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">

1547

</td>

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<pre style="margin: 0;"> <span id="LC1547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1) Start with:</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1526" 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">

1526

</td>

<td class="diff-line-num new_line" data-linenumber="1548" 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">

1548

</td>

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<pre style="margin: 0;"> <span id="LC1548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      elem x "<knownString>"</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1527" 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">

1527

</td>

<td class="diff-line-num new_line" data-linenumber="1549" 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">

1549

</td>

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<pre style="margin: 0;"> <span id="LC1549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2) Desugar:</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1528" 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">

1528

</td>

<td class="diff-line-num new_line" data-linenumber="1550" 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">

1550

</td>

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<pre style="margin: 0;"> <span id="LC1550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      elem x (unpackCString# "<knownString>"#)</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1529" 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">

1529

</td>

<td class="diff-line-num new_line old" data-linenumber="1551" 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">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3) Apply "unpack" RULE in GHC.Base: [<span class="idiff left right">Phase 2 and earlier]</span></span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1530" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1551" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1551

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3) Apply "unpack" RULE in GHC.Base: [<span class="idiff left right">InitialPhase, Phase 2 and later]:</span></span></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1530" 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">

1530

</td>

<td class="diff-line-num new_line" data-linenumber="1552" 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">

1552

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      elem x (build (unpackFoldrCString# "<knownString>"#))</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1531" 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">

1531

</td>

<td class="diff-line-num new_line" data-linenumber="1553" 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">

1553

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1553" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3) Apply "build/elem" rule [Phase 2 and later]</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1532" 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">

1532

</td>

<td class="diff-line-num new_line old" data-linenumber="1554" 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">

</td>

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<pre style="margin: 0;">-<span id="LC1532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   + inline foldCString# [Phase 0]:</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1533" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1554" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1554

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1554" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   + inline foldCString# [Phase 0].</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1533" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1555" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1555

</td>

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<pre style="margin: 0;">+<span id="LC1555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   Which gives this code:</span></span>

</pre>

</td>

</tr>

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<td class="diff-line-num old_line" data-linenumber="1533" 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">

1533

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1556

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<pre style="margin: 0;"> <span id="LC1556" class="line" lang="haskell"></span>

</pre>

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1534

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1557

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<pre style="margin: 0;"> <span id="LC1557" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      joinrec {</span></span>

</pre>

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1535

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1558

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<pre style="margin: 0;"> <span id="LC1558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        unpack_a1ui (nh_ayh :: Int#)</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1547" 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="1570" 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">@@ -1547,24 +1570,32 @@ built in rules what would happen is:</td>

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1547

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1570

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<pre style="margin: 0;"> <span id="LC1570" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      }</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1548" 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">

1548

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1571

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<pre style="margin: 0;"> <span id="LC1571" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1549" 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">

1549

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1572

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<pre style="margin: 0;"> <span id="LC1572" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which is not *bad* we do not allocate, but we perform linear search</span></span>

</pre>

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1550

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<pre style="margin: 0;">-<span id="LC1550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on the string.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1551" 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">

1551

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<td class="diff-line-num new_line old" data-linenumber="1573" 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="LC1551" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1552" 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">

1552

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<pre style="margin: 0;">-<span id="LC1552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So instead we use match_elem to look for applications of elem to known</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1553" 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">

1553

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<td class="diff-line-num new_line old" data-linenumber="1573" 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="LC1553" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">strings during all phases and transform them into case expressions</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1554" 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">

1554

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<td class="diff-line-num new_line old" data-linenumber="1573" 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="LC1554" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">explicitly. Depending on the content of the string we then end up</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1555" 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">

1555

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<pre style="margin: 0;">-<span id="LC1555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with either a decision trees or lookup tables.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1556" 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">

1556

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<pre style="margin: 0;">-<span id="LC1556" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1557" 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">

1557

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<pre style="margin: 0;">-<span id="LC1557" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Userwritten patterns of `elem x "<knownString>"` will all</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1558" 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">

1558

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<pre style="margin: 0;">-<span id="LC1558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be caught during the initial phase since we match on both the</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1559" 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">

1559

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<td class="diff-line-num new_line old" data-linenumber="1573" 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="LC1559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">desugared form and the form after applying the "unpack" rule.</span></span>

</pre>

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1560

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<pre style="margin: 0;">-<span id="LC1560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So it does not matter which rule ends up firing first.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1561" 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">

1561

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<pre style="margin: 0;">-<span id="LC1561" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1562" 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">

1562

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<pre style="margin: 0;">-<span id="LC1562" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Should we get this pattern in a later pass it's a toin coss</span></span>

</pre>

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1563

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<pre style="margin: 0;">-<span id="LC1563" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">if we get a case statement or linear search. But linear search</span></span>

</pre>

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1564

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<td class="diff-line-num new_line old" data-linenumber="1573" 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="LC1564" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">isn't bad enough to loose sleep over this scenario.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1565" 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">

1565

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<td class="diff-line-num new_line old" data-linenumber="1573" 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="LC1565" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1566" 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">

1566

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<td class="diff-line-num new_line old" data-linenumber="1573" 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="LC1566" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The only exception is that we disable this rule for overly large</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1567" 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">

1567

</td>

<td class="diff-line-num new_line old" data-linenumber="1573" 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="LC1567" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">strings (>= 500 bytes). This avoid code size blow up if we check</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1573" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1573

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<pre style="margin: 0;">+<span id="LC1573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on the string which being O(n) is in most cases worse.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1574" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1574

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<pre style="margin: 0;">+<span id="LC1574" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="1575" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1575

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<pre style="margin: 0;">+<span id="LC1575" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So what we do is:</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1576" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1576

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<pre style="margin: 0;">+<span id="LC1576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a) Match on elem applications to known strings.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1577" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1577

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<pre style="margin: 0;">+<span id="LC1577" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">b) Transform them into a case via a builtin rule.</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1578" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1578

</td>

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<pre style="margin: 0;">+<span id="LC1578" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1579" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1579

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<pre style="margin: 0;">+<span id="LC1579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However we want to match on applications before we hit phase 2 as</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1580" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1580

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<pre style="margin: 0;">+<span id="LC1580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">otherwise the "build/elem" rule might fire first and we end up</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1581" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1581

</td>

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<pre style="margin: 0;">+<span id="LC1581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with linear search.</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1582" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1582

</td>

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<pre style="margin: 0;">+<span id="LC1582" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1583" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1583

</td>

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<pre style="margin: 0;">+<span id="LC1583" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For this reason we match on both, the desugared from and the form</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1584" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1584

</td>

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<pre style="margin: 0;">+<span id="LC1584" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">after the "unpack" rule has been applied. This way it does not</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1585" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1585

</td>

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<pre style="margin: 0;">+<span id="LC1585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">matter if the unpack rule or the builtin rule fires first and we</span></span>

</pre>

</td>

</tr>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1586

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<pre style="margin: 0;">+<span id="LC1586" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">can finish the whole transformation in the InitialPhase during which</span></span>

</pre>

</td>

</tr>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1587" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1587

</td>

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<pre style="margin: 0;">+<span id="LC1587" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"build/elem" is not yet active.</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1588" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1588

</td>

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<pre style="margin: 0;">+<span id="LC1588" class="line" lang="haskell"></span>

</pre>

</td>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1589" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1589

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<pre style="margin: 0;">+<span id="LC1589" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Should the patterns we match on only emerge in later phases because</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1590" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1590

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<pre style="margin: 0;">+<span id="LC1590" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of inlining or other optimizations it's a toin coss which rule fires</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1591" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1591

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<pre style="margin: 0;">+<span id="LC1591" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">first ("build/elem" or the one defined by match_elem) so we either</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1592" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1592

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<pre style="margin: 0;">+<span id="LC1592" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">get a case statement or linear search.</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1593" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1593

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<pre style="margin: 0;">+<span id="LC1593" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But this is relatively rare and linear search isn't bad enough to</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1594" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1594

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<pre style="margin: 0;">+<span id="LC1594" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">loose sleep over this scenario. Especially since there is no easy</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1595" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1595

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<pre style="margin: 0;">+<span id="LC1595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">way to change this.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1596" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1596

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<pre style="margin: 0;">+<span id="LC1596" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1597" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1597

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<pre style="margin: 0;">+<span id="LC1597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do disable this optimiatzion for overly long strings strings</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1598" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1598

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<pre style="margin: 0;">+<span id="LC1598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(>= 500 bytes). This avoids code size blow up if we check</span></span>

</pre>

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1568

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<td class="diff-line-num new_line" data-linenumber="1599" 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">

1599

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<pre style="margin: 0;"> <span id="LC1599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for many sparse values.</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1569" 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">

1569

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<td class="diff-line-num new_line" data-linenumber="1600" 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">

1600

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<pre style="margin: 0;"> <span id="LC1600" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1570" 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">

1570

</td>

<td class="diff-line-num new_line" data-linenumber="1601" 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">

1601

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<pre style="margin: 0;"> <span id="LC1601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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<br>

</li>

<li id="5550456b4c18a3437d117712bc1421c71cca5d98">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c9e7c782bc1414f960d1116267c683da28f961df#5550456b4c18a3437d117712bc1421c71cca5d98"><strong>libraries/ghc-prim/GHC/CString.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="30" 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="30" 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">@@ -30,6 +30,64 @@ module GHC.CString (</td>

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30

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<td class="diff-line-num new_line" data-linenumber="30" 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">

30

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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types</span></span>

</pre>

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31

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<td class="diff-line-num new_line" data-linenumber="31" 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">

31

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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prim</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="32" 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">

32

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<td class="diff-line-num new_line" data-linenumber="32" 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">

32

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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

33

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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="34" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

34

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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [String literals in GHC]</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="35" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

35

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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

</td>

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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">String literals get quite a bit of special handling in GHC.  This Note</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">summarises the moving parts.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Desugaring: see GHC.HsToCore.Match.Literal.dsLit, which in</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  turn calls GHC.Core.Make.mkStringExprFS.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  The desugarer desugars the Haskell literal "foo" into Core</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     GHC.CString.unpackCString# "foo"#</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  where "foo"# is primitive string literal (of type Addr#).</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  When the string cannot be encoded as a C string, we use UTF8:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     GHC.CString.unpackCStringUtf8# "foo"#</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The library module ghc-prim:GHC.CString has a bunch of functions that</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  work over primitive strings, including GHC.CString.unpackCString#</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="51" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* GHC.Core.Op.ConstantFold has some RULES that optimise treatment of</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="53" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  literal strings. These include things like:</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="54" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="55" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    + Special handling of elem over string literals.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    + Constant folding the desugared form of ("foo" ++ "bar")</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="57" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      into ("foobar")</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="58" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    + and more</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="59" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

59

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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="60" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* GHC.Base has a number of regular rules for String literals.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="61" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

61

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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="62" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  + a rule "eqString": (==) @String = eqString</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="63" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    where GHC.Base.eqString :: String -> String -> Bool</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="64" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

64

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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="65" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    ConstantFold has a RULE for eqString on literals:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     eqString (Lit "foo"#) (Lit "bar"#) --> False</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="67" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="68" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    This allows compile time evaluation of things like "foo" == "bar"</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="70" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  + A bunch of rules to promote fusion:</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="71" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    "unpack"       [~1] forall a   . unpackCString# a             = build (unpackFoldrCString# a)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="73" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    "unpack-list"  [1]  forall a   . unpackFoldrCString# a (:) [] = unpackCString# a</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="74" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    "unpack-append"     forall a n . unpackFoldrCString# a (:) n  = unpackAppendCString# a n</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="75" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="76" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

76

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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    And UTF8 variants of these rules.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="77" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

77

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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="78" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

78

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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We allow primitive (unlifted) literal strings to be top-level</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="79" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

79

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  bindings, breaking out usual rule.  See GHC.Core</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="80" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

80

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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  Note [Core top-level string literals]</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="81" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

81

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="82" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

82

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* TODO: There is work on a special code-gen path for top-level boxed strings</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="83" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

83

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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     str :: [Char]</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="84" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

84

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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     str = unpackCString# "foo"#</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="85" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

85

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  so that they can all share a common code pointer</span></span>

</pre>

</td>

</tr>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="86" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

86

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="87" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

87

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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  There is a WIP MR on gitlab for this: !3012</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="88" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

88

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="89" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

89

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

</td>

</tr>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="90" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

90

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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

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<td class="diff-line-num old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

33

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<td class="diff-line-num new_line" data-linenumber="91" 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">

91

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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------------------------</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="34" 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">

34

</td>

<td class="diff-line-num new_line" data-linenumber="92" 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">

92

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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Unpacking C strings</span></span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="35" 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">

35

</td>

<td class="diff-line-num new_line" data-linenumber="93" 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">

93

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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------------------------</span></span>

</pre>

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