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<h3>
Shayne Fletcher pushed to branch wip/T18599
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3ac563e1070bd00b66ebc017a490489c7b54f8e">f3ac563e</a></strong>
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<span>by Shayne Fletcher</span>
<i>at 2020-11-15T19:17:09-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rework projection syntax
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<h4>7 changed files:</h4>
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<a href="#cc97d81e7223ad4a3a5e801156ca632f9fa75654">
compiler/GHC/Hs/Expr.hs
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<li class="file-stats">
<a href="#649144a78135a23cabfc90dd83c4aabf448eb6ab">
compiler/GHC/Iface/Ext/Ast.hs
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<li class="file-stats">
<a href="#bf951467d4a9aa443cb109cb4c84a2891945649b">
compiler/GHC/Parser.y
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<li class="file-stats">
<a href="#446cb12ca6cefaf1c6eb79b7db643632744263c7">
compiler/GHC/Parser/PostProcess.hs
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<li class="file-stats">
<a href="#b47ece2bbb8303a5792c2fdc52394c8ed336e8a2">
compiler/GHC/Rename/Expr.hs
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<a href="#902811828741e6bcd64702935bbb54edbbd070ef">
compiler/GHC/Tc/Gen/Expr.hs
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<li class="file-stats">
<a href="#93bba9b9e0195db135fec54160523a427ea042fd">
compiler/GHC/Tc/Types/Origin.hs
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<h4>Changes:</h4>
<li id="cc97d81e7223ad4a3a5e801156ca632f9fa75654">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3ac563e1070bd00b66ebc017a490489c7b54f8e#cc97d81e7223ad4a3a5e801156ca632f9fa75654"><strong>compiler/GHC/Hs/Expr.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -493,15 +493,14 @@ data HsExpr p</td>
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<pre style="margin: 0;"> <span id="LC493" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- langauge extensions is enabled.</span></span>
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<pre style="margin: 0;"> <span id="LC494" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC495" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. .x = Projection {</span></span>
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<pre style="margin: 0;">-<span id="LC496" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- proj_ext=noExtField, proj_<span class="idiff left right">rhs=Nothing, proj_fIELD=x</span>, proj_projection = \z -> z.x</span></span>
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<pre style="margin: 0;">+<span id="LC496" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- proj_ext=noExtField, proj_<span class="idiff left right">fIELDS=[.x]</span>, proj_projection = \z -> z.x</span></span>
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- },</span></span>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- .x.y = Projection {</span></span>
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<pre style="margin: 0;">-<span id="LC499" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- proj_ext=noExtField, proj_<span class="idiff left right">rhs=Just .x, proj_fIELD=y</span>, proj_projection = (\z -> z.y) . (\z -> z.x)</span></span>
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<pre style="margin: 0;">+<span id="LC499" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- proj_ext=noExtField, proj_<span class="idiff left right">fIELDS=[.x, .y]</span>, proj_projection = (\z -> z.y) . (\z -> z.x)</span></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- }</span></span>
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<pre style="margin: 0;"> <span id="LC501" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Projection</span></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">proj_ext</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">XProjection</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">-<span id="LC503" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">proj_rhs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC504" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">proj_fIELD</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span></span>
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">proj_fIELDS</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC504" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">proj_projection</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="n" style="color: #333;">p</span> <span class="c1" style="color: #998; font-style: italic;">-- Equivalent 'getField' term.</span></span>
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<pre style="margin: 0;"> <span id="LC505" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1255,10 +1254,8 @@ ppr_expr (RecordUpd { rupd_expr = L _ aexp, rupd_flds = rbinds })</td>
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1254
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<pre style="margin: 0;"> <span id="LC1254" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GetField</span> <span class="p">{</span> <span class="n" style="color: #333;">gf_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">fexp</span><span class="p">,</span> <span class="n" style="color: #333;">gf_fIELD</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">field</span><span class="p">,</span> <span class="n" style="color: #333;">gf_getField</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">})</span></span>
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1256
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1255
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<pre style="margin: 0;"> <span id="LC1255" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fexp</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">dot</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">field</span></span>
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1257
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1256
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<pre style="margin: 0;"> <span id="LC1256" class="line" lang="haskell"></span>
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1258
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<pre style="margin: 0;">-<span id="LC1258" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Projection</span> <span class="p">{</span> <span class="n" style="color: #333;">proj_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybeRhs</span><span class="p">,</span> <span class="n" style="color: #333;">proj_fIELD</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">field</span><span class="p">,</span> <span class="n" style="color: #333;">proj_projection</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">})</span></span>
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1259
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<td class="diff-line-num new_line old" data-linenumber="1257" 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="LC1259" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">maybeRhs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1260
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<td class="diff-line-num new_line old" data-linenumber="1257" 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="LC1260" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">dot</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">field</span></span>
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1261
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<td class="diff-line-num new_line old" data-linenumber="1257" 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="LC1261" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">dot</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">field</span></span>
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1257
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<pre style="margin: 0;">+<span id="LC1257" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Projection</span> <span class="p">{</span> <span class="n" style="color: #333;">proj_fIELDS</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">proj_projection</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">})</span></span>
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1258
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<pre style="margin: 0;">+<span id="LC1258" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span> <span class="cm" style="color: #998; font-style: italic;">{- TODO: implement this -}</span></span>
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1262
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1259
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<pre style="margin: 0;"> <span id="LC1259" class="line" lang="haskell"></span>
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1263
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1260
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<pre style="margin: 0;"> <span id="LC1260" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExprWithTySig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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1264
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1261
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<pre style="margin: 0;"> <span id="LC1261" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">nest</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr_lexpr</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1415" 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="1412" 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">@@ -1415,9 +1412,8 @@ hsExprNeedsParens p = go</td>
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1415
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1412
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<pre style="margin: 0;"> <span id="LC1412" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RecordCon</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1416
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1413
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<pre style="margin: 0;"> <span id="LC1413" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1417
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<td class="diff-line-num new_line" data-linenumber="1414" 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">
1414
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<pre style="margin: 0;"> <span id="LC1414" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1418" 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">
1418
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<pre style="margin: 0;">-<span id="LC1418" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Not entirely clear about these.</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1419" 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">
1419
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<pre style="margin: 0;">-<span id="LC1419" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GetField</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1420
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<pre style="margin: 0;">-<span id="LC1420" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Projection</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1415
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<pre style="margin: 0;">+<span id="LC1415" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Projection</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC1416" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GetField</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- Remember to have a closer look at this.</span></span>
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1417
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<pre style="margin: 0;"> <span id="LC1417" class="line" lang="haskell"></span>
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1418
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<pre style="margin: 0;"> <span id="LC1418" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XExpr</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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1423
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1419
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<pre style="margin: 0;"> <span id="LC1419" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ghcPass</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">p</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3ac563e1070bd00b66ebc017a490489c7b54f8e#649144a78135a23cabfc90dd83c4aabf448eb6ab"><strong>compiler/GHC/Iface/Ext/Ast.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1165,9 +1165,7 @@ instance HiePass p => ToHie (Located (HsExpr (GhcPass p))) where</td>
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1165
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1165
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<pre style="margin: 0;"> <span id="LC1165" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GetField</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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1166
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1166
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<pre style="margin: 0;"> <span id="LC1166" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">toHie</span> <span class="n" style="color: #333;">expr</span></span>
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1167
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1167
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<pre style="margin: 0;"> <span id="LC1167" class="line" lang="haskell"> <span class="p">]</span></span>
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1168
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<pre style="margin: 0;">-<span id="LC1168" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Projection</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">maybeExpr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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1169
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<pre style="margin: 0;">-<span id="LC1169" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">toHie</span> <span class="n" style="color: #333;">maybeExpr</span></span>
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1170
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<pre style="margin: 0;">-<span id="LC1170" class="line" lang="haskell"> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1168" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Projection</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1171
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<pre style="margin: 0;"> <span id="LC1169" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XExpr</span> <span class="n" style="color: #333;">x</span></span>
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1172
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1170
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<pre style="margin: 0;"> <span id="LC1170" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ghcPass</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">p</span></span>
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1173
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<pre style="margin: 0;"> <span id="LC1171" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">WrapExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrap</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">x</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3ac563e1070bd00b66ebc017a490489c7b54f8e#bf951467d4a9aa443cb109cb4c84a2891945649b"><strong>compiler/GHC/Parser.y</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2754,7 +2754,12 @@ aexp2 :: { ECP }</td>
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<pre style="margin: 0;"> <span id="LC2754" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">mop</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">++</span> <span class="p">[</span><span class="n" style="color: #333;">mcp</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">])</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2755" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2756" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This case is only possible when 'RecordDotSyntax' is enabled.</span></span>
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<pre style="margin: 0;">-<span id="LC2757" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'('</span> <span class="n" style="color: #333;">projection</span> <span class="sc" style="color: #d14;">')'</span> <span class="p">{</span> <span class="n" style="color: #333;">ecpFromExp</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2757" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'('</span> <span class="n" style="color: #333;">projection</span> <span class="sc" style="color: #d14;">')'</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="o" style="font-weight: 600;">$</span></span>
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2758
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<pre style="margin: 0;">+<span id="LC2758" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">loc</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">anns</span><span class="p">,</span> <span class="n" style="color: #333;">fIELDS</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2759" 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">
2759
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<pre style="margin: 0;">+<span id="LC2759" class="line" lang="haskell"> <span class="n" style="color: #333;">span</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">combineSrcSpans</span> <span class="p">(</span><span class="n" style="color: #333;">combineSrcSpans</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">)</span></span>
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2760
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<pre style="margin: 0;">+<span id="LC2760" class="line" lang="haskell"> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkProjection</span> <span class="n" style="color: #333;">span</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">fIELDS</span><span class="p">)</span></span>
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2761
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<pre style="margin: 0;">+<span id="LC2761" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">amms</span> <span class="p">(</span><span class="n" style="color: #333;">ecpFromExp'</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="p">([</span><span class="n" style="color: #333;">mop</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">]</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">anns</span> <span class="o" style="font-weight: 600;">++</span> <span class="p">[</span><span class="n" style="color: #333;">mcp</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">])</span></span>
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2762
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<pre style="margin: 0;">+<span id="LC2762" class="line" lang="haskell"> <span class="p">}</span></span>
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2758
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2763
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<pre style="margin: 0;"> <span id="LC2763" class="line" lang="haskell"></span>
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2759
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2764
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<pre style="margin: 0;"> <span id="LC2764" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'(</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">#</span><span class="sc" style="color: #d14;">' </span><span class="err" style="color: #a61717; background-color: #e3d2d2;">t</span><span class="n" style="color: #333;">exp</span> <span class="sc" style="color: #d14;">'#</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">)</span><span class="sc" style="color: #d14;">' </span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="o" style="font-weight: 600;">$</span></span>
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2760
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2765
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<pre style="margin: 0;"> <span id="LC2765" class="line" lang="haskell"> <span class="n" style="color: #333;">unECP</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">-></span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2804" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2804,13 +2809,13 @@ aexp2 :: { ECP }</td>
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2804
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2809
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<pre style="margin: 0;"> <span id="LC2809" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">))</span></span>
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2805
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2810
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<pre style="margin: 0;"> <span id="LC2810" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">AnnOpenB</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">AnnCloseB</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">4</span><span class="p">]</span> <span class="p">}</span></span>
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2806
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2811
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<pre style="margin: 0;"> <span id="LC2811" class="line" lang="haskell"></span>
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2807
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<pre style="margin: 0;">-<span id="LC2807" class="line" lang="haskell"><span class="n" style="color: #333;">projection</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">LHsExpr</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">GhcPs</span></span> <span class="p">}</span></span>
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2812
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<pre style="margin: 0;">+<span id="LC2812" class="line" lang="haskell"><span class="n" style="color: #333;">projection</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">SrcSpan</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">([</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AddAnn</span></span><span class="p"><span class="idiff">],</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Located</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">FastString</span></span><span class="p"><span class="idiff right">]))</span></span> <span class="p">}</span></span>
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2808
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2813
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<pre style="margin: 0;"> <span id="LC2813" class="line" lang="haskell"><span class="n" style="color: #333;">projection</span></span>
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2809
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2814
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<pre style="margin: 0;"> <span id="LC2814" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Whitespace-sensitive operator parsing] in GHC.Parsing.Lexer</span></span>
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2810
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2815
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<pre style="margin: 0;"> <span id="LC2815" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">projection</span> <span class="kt" style="color: #458; font-weight: 600;">TIGHT_INFIX_PROJ</span> <span class="n" style="color: #333;">field</span></span>
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2811
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<pre style="margin: 0;">-<span id="LC2811" class="line" lang="haskell"> <span class="p">{</span><span class="o" style="font-weight: 600;"><span class="idiff left">%</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ams</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkProjection</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">comb3</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">2</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">3</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Just</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">3</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">mj</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnDot</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">2</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;">-<span id="LC2812" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">|</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PREFIX_PROJ</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">field</span></span></span>
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<pre style="margin: 0;">-<span id="LC2813" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">{</span></span><span class="o" style="font-weight: 600;"><span class="idiff">%</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ams</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkProjection</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">comb2</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">2</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nothing</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">2</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">mj</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnDot</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="p"><span class="idiff right">]</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2816" class="line" lang="haskell"> <span class="p">{</span><span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">let</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">anns</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fs</span></span><span class="p"><span class="idiff">))</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">in</span></span></span>
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2817
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<pre style="margin: 0;">+<span id="LC2817" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">combineSrcSpans</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">combineSrcSpans</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">gl</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">2</span></span><span class="p"><span class="idiff">))</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">gl</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">3</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mj</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnDot</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">2</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">anns</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">3</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fs</span></span><span class="p"><span class="idiff">))</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;">+<span id="LC2818" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">|</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PREFIX_PROJ</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">field</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">comb2</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">2</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">([</span></span><span class="n" style="color: #333;"><span class="idiff">mj</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnDot</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="p"><span class="idiff">],</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">2</span></span><span class="p"><span class="idiff right">]))</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2819" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2820" class="line" lang="haskell"><span class="n" style="color: #333;">splice_exp</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="p">}</span></span>
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2821
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<pre style="margin: 0;"> <span id="LC2821" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">splice_untyped</span> <span class="p">{</span> <span class="n" style="color: #333;">mapLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsSpliceE</span> <span class="n" style="color: #333;">noExtField</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3ac563e1070bd00b66ebc017a490489c7b54f8e#446cb12ca6cefaf1c6eb79b7db643632744263c7"><strong>compiler/GHC/Parser/PostProcess.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3009,17 +3009,33 @@ zPat = noLoc $ VarPat noExtField (noLoc $ mkRdrUnqual (mkVarOcc "z"))</td>
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<pre style="margin: 0;"> <span id="LC3009" class="line" lang="haskell"><span class="n" style="color: #333;">zVar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkRdrUnqual</span> <span class="p">(</span><span class="n" style="color: #333;">mkVarOcc</span> <span class="s" style="color: #d14;">"z"</span><span class="p">))</span></span>
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3010
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<pre style="margin: 0;"> <span id="LC3010" class="line" lang="haskell"><span class="n" style="color: #333;">circ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkRdrUnqual</span> <span class="p">(</span><span class="n" style="color: #333;">mkVarOcc</span> <span class="s" style="color: #d14;">"."</span><span class="p">))</span></span>
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3011
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<pre style="margin: 0;"> <span id="LC3011" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3012" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mkProj rhs fIELD calculates a projection.</span></span>
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<pre style="margin: 0;">-<span id="LC3013" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- e.g. .x = mkProj Nothing x = \z -> z.x = \z -> (getField @fIELD x)</span></span>
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<pre style="margin: 0;">-<span id="LC3014" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- .x.y = mkProj Just(.x) y = (.y) . (.x) = (\z -> z.y) . (\z -> z.x)</span></span>
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<pre style="margin: 0;">-<span id="LC3015" class="line" lang="haskell"><span class="n" style="color: #333;">mkProj</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;">-<span id="LC3016" class="line" lang="haskell"><span class="n" style="color: #333;">mkProj</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">fIELD</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC3017" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkGet</span> <span class="n" style="color: #333;">zVar</span> <span class="n" style="color: #333;">fIELD</span></span>
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<pre style="margin: 0;">-<span id="LC3018" class="line" lang="haskell"> <span class="n" style="color: #333;">grhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">GRHS</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">body</span></span>
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<pre style="margin: 0;">-<span id="LC3019" class="line" lang="haskell"> <span class="n" style="color: #333;">ghrss</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">[</span><span class="n" style="color: #333;">grhs</span><span class="p">]</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EmptyLocalBinds</span> <span class="n" style="color: #333;">noExtField</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC3020" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Match</span> <span class="p">{</span><span class="n" style="color: #333;">m_ext</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">noExtField</span><span class="p">,</span> <span class="n" style="color: #333;">m_ctxt</span><span class="o" style="font-weight: 600;">=</span><span class="kt" style="color: #458; font-weight: 600;">LambdaExpr</span><span class="p">,</span> <span class="n" style="color: #333;">m_pats</span><span class="o" style="font-weight: 600;">=</span><span class="p">[</span><span class="n" style="color: #333;">zPat</span><span class="p">],</span> <span class="n" style="color: #333;">m_grhss</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">ghrss</span><span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC3021" class="line" lang="haskell"> <span class="n" style="color: #333;">lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkParen</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsLam</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">MG</span> <span class="p">{</span><span class="n" style="color: #333;">mg_ext</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">noExtField</span><span class="p">,</span> <span class="n" style="color: #333;">mg_alts</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">noLoc</span> <span class="p">[</span><span class="n" style="color: #333;">m</span><span class="p">],</span> <span class="n" style="color: #333;">mg_origin</span><span class="o" style="font-weight: 600;">=</span><span class="kt" style="color: #458; font-weight: 600;">Generated</span><span class="p">})</span> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">-<span id="LC3022" class="line" lang="haskell"> <span class="n" style="color: #333;">maybe</span> <span class="n" style="color: #333;">lhs</span> <span class="p">(</span><span class="n" style="color: #333;">mkParen</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">mkOpApp</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">circ</span><span class="p">)</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC3012" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mkProj' fIELDS calculates a projection.</span></span>
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<pre style="margin: 0;">+<span id="LC3013" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- e.g. .x = mkProj' x = \z -> z.x = \z -> (getField @fIELD x)</span></span>
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<pre style="margin: 0;">+<span id="LC3014" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- .x.y = mkProj' [.x, .y] = (.y) . (.x) = (\z -> z.y) . (\z -> z.x)</span></span>
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<pre style="margin: 0;">+<span id="LC3015" class="line" lang="haskell"><span class="n" style="color: #333;">mkProj</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;">+<span id="LC3016" class="line" lang="haskell"><span class="n" style="color: #333;">mkProj</span> <span class="p">(</span><span class="n" style="color: #333;">fIELD</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">fIELDS</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl'</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">proj</span> <span class="n" style="color: #333;">fIELD</span><span class="p">)</span> <span class="n" style="color: #333;">fIELDS</span></span>
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<pre style="margin: 0;">+<span id="LC3017" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC3018" class="line" lang="haskell"> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">acc</span> <span class="n" style="color: #333;">fIELD</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">mkParen</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">mkOpApp</span> <span class="p">(</span><span class="n" style="color: #333;">proj</span> <span class="n" style="color: #333;">fIELD</span><span class="p">)</span> <span class="n" style="color: #333;">circ</span><span class="p">)</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;">+<span id="LC3019" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3020" class="line" lang="haskell"> <span class="n" style="color: #333;">proj</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span></span>
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3021
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<pre style="margin: 0;">+<span id="LC3021" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkGet</span> <span class="n" style="color: #333;">zVar</span> <span class="n" style="color: #333;">f</span></span>
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3022
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<pre style="margin: 0;">+<span id="LC3022" class="line" lang="haskell"> <span class="n" style="color: #333;">grhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">GRHS</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">body</span></span>
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3023
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<pre style="margin: 0;">+<span id="LC3023" class="line" lang="haskell"> <span class="n" style="color: #333;">ghrss</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">[</span><span class="n" style="color: #333;">grhs</span><span class="p">]</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EmptyLocalBinds</span> <span class="n" style="color: #333;">noExtField</span><span class="p">))</span></span>
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3024
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<pre style="margin: 0;">+<span id="LC3024" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Match</span> <span class="p">{</span><span class="n" style="color: #333;">m_ext</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">noExtField</span><span class="p">,</span> <span class="n" style="color: #333;">m_ctxt</span><span class="o" style="font-weight: 600;">=</span><span class="kt" style="color: #458; font-weight: 600;">LambdaExpr</span><span class="p">,</span> <span class="n" style="color: #333;">m_pats</span><span class="o" style="font-weight: 600;">=</span><span class="p">[</span><span class="n" style="color: #333;">zPat</span><span class="p">],</span> <span class="n" style="color: #333;">m_grhss</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">ghrss</span><span class="p">}</span> <span class="kr" style="font-weight: 600;">in</span></span>
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3025
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<pre style="margin: 0;">+<span id="LC3025" class="line" lang="haskell"> <span class="n" style="color: #333;">mkParen</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsLam</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">MG</span> <span class="p">{</span><span class="n" style="color: #333;">mg_ext</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">noExtField</span><span class="p">,</span> <span class="n" style="color: #333;">mg_alts</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">noLoc</span> <span class="p">[</span><span class="n" style="color: #333;">m</span><span class="p">],</span> <span class="n" style="color: #333;">mg_origin</span><span class="o" style="font-weight: 600;">=</span><span class="kt" style="color: #458; font-weight: 600;">Generated</span><span class="p">})</span></span>
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3026
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<pre style="margin: 0;">+<span id="LC3026" class="line" lang="haskell"><span class="n" style="color: #333;">mkProj</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"mkProj': The impossible happened"</span></span>
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3027
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<pre style="margin: 0;">+<span id="LC3027" class="line" lang="haskell"></span>
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3028
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<pre style="margin: 0;">+<span id="LC3028" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- -- mkProj rhs fIELD calculates a projection.</span></span>
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3029
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<pre style="margin: 0;">+<span id="LC3029" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- -- e.g. .x = mkProj Nothing x = \z -> z.x = \z -> (getField @fIELD x)</span></span>
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3030
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<pre style="margin: 0;">+<span id="LC3030" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- -- .x.y = mkProj Just(.x) y = (.y) . (.x) = (\z -> z.y) . (\z -> z.x)</span></span>
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3031
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<pre style="margin: 0;">+<span id="LC3031" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mkProj :: Maybe (LHsExpr GhcPs) -> Located FastString -> LHsExpr GhcPs</span></span>
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3032
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<pre style="margin: 0;">+<span id="LC3032" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mkProj rhs fIELD =</span></span>
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3033
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<pre style="margin: 0;">+<span id="LC3033" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- let body = mkGet zVar fIELD</span></span>
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3034
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<pre style="margin: 0;">+<span id="LC3034" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- grhs = noLoc $ GRHS noExtField [] body</span></span>
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3035
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<pre style="margin: 0;">+<span id="LC3035" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ghrss = GRHSs noExtField [grhs] (noLoc (EmptyLocalBinds noExtField))</span></span>
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3036
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<pre style="margin: 0;">+<span id="LC3036" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- m = noLoc $ Match {m_ext=noExtField, m_ctxt=LambdaExpr, m_pats=[zPat], m_grhss=ghrss}</span></span>
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3037
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<pre style="margin: 0;">+<span id="LC3037" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- lhs = mkParen (noLoc $ HsLam noExtField MG {mg_ext=noExtField, mg_alts=noLoc [m], mg_origin=Generated}) in</span></span>
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3038
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<pre style="margin: 0;">+<span id="LC3038" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- maybe lhs (mkParen . mkOpApp lhs circ) rhs</span></span>
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3023
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3039
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<pre style="margin: 0;"> <span id="LC3039" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3040" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mkGet arg fIELD calcuates a get_field @fIELD arg expression.</span></span>
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<pre style="margin: 0;"> <span id="LC3041" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- e.g. z.x = mkGet z x = get_field @x z</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3038,15 +3054,24 @@ mkGetField loc arg fIELD =</td>
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<pre style="margin: 0;"> <span id="LC3054" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">gf_getField</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkGet</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">fIELD</span></span>
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<pre style="margin: 0;"> <span id="LC3055" class="line" lang="haskell"> <span class="p">}</span></span>
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3056
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<pre style="margin: 0;"> <span id="LC3056" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3041" class="line" lang="haskell"><span class="n" style="color: #333;">mkProjection</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;">-<span id="LC3042" class="line" lang="haskell"><span class="n" style="color: #333;">mkProjection</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">maybeRhs</span> <span class="n" style="color: #333;">fIELD</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC3057" class="line" lang="haskell"><span class="n" style="color: #333;">mkProjection</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;">+<span id="LC3058" class="line" lang="haskell"><span class="n" style="color: #333;">mkProjection</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"mkProjection: The impossible happened"</span></span>
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<pre style="margin: 0;">+<span id="LC3059" class="line" lang="haskell"><span class="n" style="color: #333;">mkProjection</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">fIELDS</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC3060" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="kt" style="color: #458; font-weight: 600;">Projection</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC3061" class="line" lang="haskell"> <span class="n" style="color: #333;">proj_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span></span>
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<pre style="margin: 0;">-<span id="LC3045" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">proj_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybeRhs</span></span>
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<pre style="margin: 0;">-<span id="LC3046" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">proj_fIELD</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fIELD</span></span>
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<pre style="margin: 0;">-<span id="LC3047" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">proj_projection</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkProj</span> <span class="n" style="color: #333;">maybeRhs</span> <span class="n" style="color: #333;">fIELD</span></span>
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<pre style="margin: 0;">+<span id="LC3062" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">proj_fIELDS</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fIELDS</span></span>
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<pre style="margin: 0;">+<span id="LC3063" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">proj_projection</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkProj</span> <span class="n" style="color: #333;">fIELDS</span></span>
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<pre style="margin: 0;"> <span id="LC3064" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC3065" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3066" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mkProjection :: SrcSpan -> Maybe (LHsExpr GhcPs) -> Located FastString -> LHsExpr GhcPs</span></span>
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<pre style="margin: 0;">+<span id="LC3067" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mkProjection loc maybeRhs fIELD =</span></span>
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3068
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<pre style="margin: 0;">+<span id="LC3068" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- L loc Projection {</span></span>
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3069
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<pre style="margin: 0;">+<span id="LC3069" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- proj_ext = noExtField</span></span>
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<pre style="margin: 0;">+<span id="LC3070" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , proj_rhs = maybeRhs</span></span>
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<pre style="margin: 0;">+<span id="LC3071" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , proj_fIELD = fIELD</span></span>
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3072
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<pre style="margin: 0;">+<span id="LC3072" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , proj_projection = mkProj maybeRhs fIELD</span></span>
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<pre style="margin: 0;">+<span id="LC3073" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- }</span></span>
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<pre style="margin: 0;">+<span id="LC3074" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3075" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mkSet a fIELD b calculates a set_field @fIELD expression.</span></span>
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<pre style="margin: 0;"> <span id="LC3076" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- e.g mkSet a fIELD b = set_field @"fIELD" a b (read as "set field 'fIELD' on a to b").</span></span>
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<pre style="margin: 0;"> <span id="LC3077" class="line" lang="haskell"><span class="n" style="color: #333;">mkSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<li id="b47ece2bbb8303a5792c2fdc52394c8ed336e8a2">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3ac563e1070bd00b66ebc017a490489c7b54f8e#b47ece2bbb8303a5792c2fdc52394c8ed336e8a2"><strong>compiler/GHC/Rename/Expr.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -218,14 +218,9 @@ rnExpr (GetField x e f g)</td>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GetField</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e'</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">g'</span><span class="p">,</span> <span class="n" style="color: #333;">fv</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC221" class="line" lang="haskell"><span class="n" style="color: #333;">rnExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Projection</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC222" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">e'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC223" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">-<span id="LC224" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC225" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">e'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC226" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">e'</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC227" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">p'</span><span class="p">,</span> <span class="n" style="color: #333;">fv</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLExpr</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Projection</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e'</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">p'</span><span class="p">,</span> <span class="n" style="color: #333;">fv</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="haskell"><span class="n" style="color: #333;">rnExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Projection</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">fs</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">p'</span><span class="p">,</span> <span class="n" style="color: #333;">fv</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLExpr</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Projection</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">fs</span> <span class="n" style="color: #333;">p'</span><span class="p">,</span> <span class="n" style="color: #333;">fv</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC225" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3ac563e1070bd00b66ebc017a490489c7b54f8e#902811828741e6bcd64702935bbb54edbbd070ef"><strong>compiler/GHC/Tc/Gen/Expr.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1037,7 +1037,7 @@ tcExpr (ArithSeq _ witness seq) res_ty</td>
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1037
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1038
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1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1039
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GetField</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">g</span><span class="p">))</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">res_ty</span></span>
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1040
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<pre style="margin: 0;">-<span id="LC1040" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Projection</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">p</span><span class="p">))</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC1040" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Projection</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">p</span><span class="p">))</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">res_ty</span></span>
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1041
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"></span>
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1042
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1043
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3ac563e1070bd00b66ebc017a490489c7b54f8e#93bba9b9e0195db135fec54160523a427ea042fd"><strong>compiler/GHC/Tc/Types/Origin.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -500,7 +500,7 @@ exprCtOrigin (OpApp _ _ op _) = lexprCtOrigin op</td>
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500
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"><span class="n" style="color: #333;">exprCtOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NegApp</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC501" class="line" lang="haskell"><span class="n" style="color: #333;">exprCtOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsPar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"><span class="n" style="color: #333;">exprCtOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GetField</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC503" class="line" lang="haskell"><span class="n" style="color: #333;">exprCtOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Projection</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SectionOrigin</span></span>
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"><span class="n" style="color: #333;">exprCtOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Projection</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p"><span class="idiff left">)</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SectionOrigin</span></span>
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<pre style="margin: 0;"> <span id="LC504" class="line" lang="haskell"><span class="n" style="color: #333;">exprCtOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SectionL</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SectionOrigin</span></span>
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<pre style="margin: 0;"> <span id="LC505" class="line" lang="haskell"><span class="n" style="color: #333;">exprCtOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SectionR</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SectionOrigin</span></span>
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="haskell"><span class="n" style="color: #333;">exprCtOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExplicitTuple</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Shouldn'tHappenOrigin</span> <span class="s" style="color: #d14;">"explicit tuple"</span></span>
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