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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/c4cc62822e903ebbc1b2c582fa31d2abe315b7b7">c4cc6282</a></strong>
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<span>by Shayne Fletcher</span>
<i>at 2020-09-08T17:25:00-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve location handling
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<h4>2 changed files:</h4>
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<a href="#bf951467d4a9aa443cb109cb4c84a2891945649b">
compiler/GHC/Parser.y
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<a href="#446cb12ca6cefaf1c6eb79b7db643632744263c7">
compiler/GHC/Parser/PostProcess.hs
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<h4>Changes:</h4>
<li id="bf951467d4a9aa443cb109cb4c84a2891945649b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4cc62822e903ebbc1b2c582fa31d2abe315b7b7#bf951467d4a9aa443cb109cb4c84a2891945649b"><strong>compiler/GHC/Parser.y</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3256" 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">@@ -3256,7 +3256,7 @@ fbind :: { forall b. DisambECP b => PV (Fbind b) }</td>
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3256
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3256
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<pre style="margin: 0;"> <span id="LC3256" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">field</span> <span class="kt" style="color: #458; font-weight: 600;">TIGHT_INFIX_PROJ</span> <span class="n" style="color: #333;">fieldToUpdate</span> <span class="sc" style="color: #d14;">'='</span> <span class="n" style="color: #333;">texp</span></span>
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3257
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3257
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<pre style="margin: 0;"> <span id="LC3257" class="line" lang="haskell"> <span class="p">{</span><span class="kr" style="font-weight: 600;">do</span></span>
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3258
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3258
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<pre style="margin: 0;"> <span id="LC3258" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">5</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unECP</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">5</span></span>
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3259
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<pre style="margin: 0;">-<span id="LC3259" class="line" lang="haskell"> <span class="n" style="color: #333;">fmap</span> <span class="kt" style="color: #458; font-weight: 600;">Pbind</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkHsFieldUpdaterPV</span> <span class="p">(</span><span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">reverse</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">5</span></span>
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3259
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<pre style="margin: 0;">+<span id="LC3259" class="line" lang="haskell"> <span class="n" style="color: #333;">fmap</span> <span class="kt" style="color: #458; font-weight: 600;">Pbind</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkHsFieldUpdaterPV</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">comb2</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</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">$</span></span><span class="mi" style="color: #099;"><span class="idiff">5</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">(</span></span><span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">reverse</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">5</span></span>
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3260
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3260
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<pre style="margin: 0;"> <span id="LC3260" class="line" lang="haskell"> <span class="p">}</span></span>
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3261
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3261
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<pre style="margin: 0;"> <span id="LC3261" class="line" lang="haskell"></span>
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3262
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3262
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<pre style="margin: 0;"> <span id="LC3262" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Whitespace-sensitive operator parsing] in Lexer.x</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">@@ -3265,13 +3265,13 @@ fbind :: { forall b. DisambECP b => PV (Fbind b) }</td>
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<pre style="margin: 0;"> <span id="LC3265" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">top</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;"> <span id="LC3266" class="line" lang="haskell"> <span class="n" style="color: #333;">fields</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">top</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">reverse</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span></span>
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3267
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<pre style="margin: 0;"> <span id="LC3267" class="line" lang="haskell"> <span class="n" style="color: #333;">final</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">last</span> <span class="n" style="color: #333;">fields</span></span>
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3268
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<pre style="margin: 0;">-<span id="LC3268" class="line" lang="haskell"> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">l</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fieldName</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="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">getLoc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">final</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">unLoc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">final</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC3268" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">l</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">comb2</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">top</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">final</span></span></span>
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3269
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<pre style="margin: 0;"> <span id="LC3269" class="line" lang="haskell"> <span class="n" style="color: #333;">puns</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getBit</span> <span class="kt" style="color: #458; font-weight: 600;">RecordPunsBit</span></span>
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3270
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3270
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<pre style="margin: 0;"> <span id="LC3270" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">puns</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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3271
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<pre style="margin: 0;">-<span id="LC3271" class="line" lang="haskell"> <span class="n" style="color: #333;">addError</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">comb2</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">top</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">final</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC3271" class="line" lang="haskell"> <span class="n" style="color: #333;">addError</span> <span class="n" style="color: #333;"><span class="idiff left right">l</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC3272" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"For this to work, enable NamedFieldPuns."</span></span>
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<pre style="margin: 0;">-<span id="LC3273" class="line" lang="haskell"> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkHsVarPV</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">L</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">l</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkRdrUnqual</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkVarOcc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">unpackFS</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fieldName</span></span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC3274" class="line" lang="haskell"> <span class="n" style="color: #333;">fmap</span> <span class="kt" style="color: #458; font-weight: 600;">Pbind</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkHsFieldUpdaterPV</span> <span class="n" style="color: #333;">fields</span> <span class="n" style="color: #333;">var</span></span>
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<pre style="margin: 0;">+<span id="LC3273" class="line" lang="haskell"> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkHsVarPV</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">noLoc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkRdrUnqual</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkVarOcc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">unpackFS</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">unLoc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">final</span></span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC3274" class="line" lang="haskell"> <span class="n" style="color: #333;">fmap</span> <span class="kt" style="color: #458; font-weight: 600;">Pbind</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkHsFieldUpdaterPV</span> <span class="n" style="color: #333;"><span class="idiff left">l</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">fields</span> <span class="n" style="color: #333;">var</span></span>
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<pre style="margin: 0;"> <span id="LC3275" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC3276" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3277" class="line" lang="haskell"><span class="n" style="color: #333;">fieldToUpdate</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</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="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4cc62822e903ebbc1b2c582fa31d2abe315b7b7#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">@@ -19,7 +19,7 @@</td>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wno-incomplete-record-updates #-}</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Parser.PostProcess</span> <span class="p">(</span></span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkApp</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkGet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkFieldUpdater</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkProj</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isGet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">applyFieldUpdates</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Fbind</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">fbindToRecField</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="c1" style="color: #998; font-style: italic;">-- RecordDot</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkApp</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkGet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkFieldUpdater</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkProj</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isGet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">applyFieldUpdates</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Fbind</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="c1" style="color: #998; font-style: italic;">-- RecordDot</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkHsOpApp</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkHsIntegral</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkHsFractional</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkHsIsString</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkHsDo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkSpliceDecl</span><span class="p">,</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">@@ -1393,7 +1393,7 @@ class b ~ (Body b) GhcPs => DisambECP b where</td>
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<pre style="margin: 0;"> <span id="LC1393" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Return an expression without ambiguity, or fail in a non-expression context.</span></span>
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<pre style="margin: 0;"> <span id="LC1394" class="line" lang="haskell"> <span class="n" style="color: #333;">ecpFromExp'</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;">PV</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1395" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | This can only be satified by expressions.</span></span>
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<pre style="margin: 0;">-<span id="LC1396" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsFieldUpdaterPV</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;">Located</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PV</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1396" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsFieldUpdaterPV</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">SrcSpan</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </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;">Located</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PV</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1397" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Disambiguate "\... -> ..." (lambda)</span></span>
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<pre style="margin: 0;"> <span id="LC1398" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsLamPV</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;">MatchGroup</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PV</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1399" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Disambiguate "let ... in ..."</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">@@ -1521,9 +1521,9 @@ instance DisambECP (HsCmd GhcPs) where</td>
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<pre style="margin: 0;"> <span id="LC1521" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Body</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsCmd</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;">HsCmd</span></span>
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<pre style="margin: 0;"> <span id="LC1522" class="line" lang="haskell"> <span class="n" style="color: #333;">ecpFromCmd'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span></span>
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<pre style="margin: 0;"> <span id="LC1523" class="line" lang="haskell"> <span class="n" style="color: #333;">ecpFromExp'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</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;">cmdFail</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1524" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsFieldUpdaterPV</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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<pre style="margin: 0;">-<span id="LC1525" class="line" lang="haskell"> <span class="n" style="color: #333;">cmdFail</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">noSrcSpan</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1526" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"<span class="idiff left right">Trying to make a field update in a command context</span>"</span></span>
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<pre style="margin: 0;">+<span id="LC1524" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsFieldUpdaterPV</span> <span class="n" style="color: #333;"><span class="idiff left">l</span></span><span class="idiff right"> </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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<pre style="margin: 0;">+<span id="LC1525" class="line" lang="haskell"> <span class="n" style="color: #333;">cmdFail</span> <span class="n" style="color: #333;"><span class="idiff left right">l</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1526" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"<span class="idiff left right">Field update syntax is not supported in commands.</span>"</span></span>
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<pre style="margin: 0;"> <span id="LC1527" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsLamPV</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">mg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsCmdLam</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">mg</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1528" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsLetPV</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">bs</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsCmdLet</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">bs</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1529" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">InfixOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsCmd</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;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</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">@@ -1587,7 +1587,7 @@ instance DisambECP (HsExpr GhcPs) where</td>
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<pre style="margin: 0;"> <span id="LC1587" class="line" lang="haskell"> <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</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC1588" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">hsHoleExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1589" class="line" lang="haskell"> <span class="n" style="color: #333;">ecpFromExp'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span></span>
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<pre style="margin: 0;">-<span id="LC1590" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsFieldUpdaterPV</span> <span class="n" style="color: #333;">fields</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkFieldUpdater</span> <span class="n" style="color: #333;">fields</span> <span class="n" style="color: #333;">arg</span></span>
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<pre style="margin: 0;">+<span id="LC1590" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsFieldUpdaterPV</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">fields</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkFieldUpdater</span> <span class="n" style="color: #333;">fields</span> <span class="n" style="color: #333;">arg</span></span>
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<pre style="margin: 0;"> <span id="LC1591" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsLamPV</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">mg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsLam</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">mg</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1592" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsLetPV</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">bs</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsLet</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">bs</span> <span class="n" style="color: #333;">c</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1593" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">InfixOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1675,9 +1675,9 @@ instance DisambECP (PatBuilder GhcPs) where</td>
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<pre style="margin: 0;"> <span id="LC1675" class="line" lang="haskell"> <span class="n" style="color: #333;">ecpFromExp'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC1676" class="line" lang="haskell"> <span class="n" style="color: #333;">addFatalError</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1677" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Expression syntax in pattern:"</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>
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<pre style="margin: 0;">-<span id="LC1678" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsFieldUpdaterPV</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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<pre style="margin: 0;">-<span id="LC1679" class="line" lang="haskell"> <span class="n" style="color: #333;">addFatalError</span> <span class="n" style="color: #333;"><span class="idiff left right">noSrcSpan</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1680" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"<span class="idiff left right">Trying to make a field update in a pattern context</span>"</span></span>
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<pre style="margin: 0;">+<span id="LC1678" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsFieldUpdaterPV</span> <span class="n" style="color: #333;"><span class="idiff left">l</span></span><span class="idiff right"> </span><span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC1679" class="line" lang="haskell"> <span class="n" style="color: #333;">addFatalError</span> <span class="n" style="color: #333;"><span class="idiff left right">l</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1680" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"<span class="idiff left right">Field update syntax is not supported in patterns.</span>"</span></span>
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<pre style="margin: 0;"> <span id="LC1681" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsLamPV</span> <span class="n" style="color: #333;">l</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addFatalError</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1682" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Lambda-syntax in pattern."</span> <span class="o" style="font-weight: 600;">$$</span></span>
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<pre style="margin: 0;"> <span id="LC1683" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Pattern matching on functions is not possible."</span></span>
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