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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/e7280c93ef8f0685bbd63552b5b72c029907687e">e7280c93</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-04-20T03:44:24Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Tagless final encoding of ExpCmdI in the parser
Before this change, we used a roundabout encoding:
1. a GADT (ExpCmdG)
2. a class to pass it around (ExpCmdI)
3. helpers to match on it (ecHsApp, ecHsIf, ecHsCase, ...)
It is more straightforward to turn these helpers into class methods,
removing the need for a GADT.
</pre>
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<h4>1 changed file:</h4>
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<li class="file-stats">
<a href="#f68eb03961d8e370e8d3f41bd51ea01fd168779e">
compiler/parser/RdrHsSyn.hs
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<h4>Changes:</h4>
<li id="f68eb03961d8e370e8d3f41bd51ea01fd168779e">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/e7280c93ef8f0685bbd63552b5b72c029907687e#f68eb03961d8e370e8d3f41bd51ea01fd168779e"><strong>compiler/parser/RdrHsSyn.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">@@ -50,7 +50,6 @@ module RdrHsSyn (</td>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="51" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="51" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Bunch of functions in the parser monad for</span></span>
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<td class="diff-line-num new_line" data-linenumber="52" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- checking and constructing values</span></span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkBlockArguments</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkPrecP</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- Int -> P Int</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkContext</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- HsType -> P HsContext</span></span>
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<td class="diff-line-num old_line" data-linenumber="56" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkPattern</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- HsExp -> P HsPat</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="61" 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="60" 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">@@ -61,7 +60,6 @@ module RdrHsSyn (</td>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkMonadComp</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- P (HsStmtContext RdrName)</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkValDef</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- (SrcLoc, HsExp, HsRhs, [HsDecl]) -> P HsDecl</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkValSigLhs</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC64" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkDoAndIfThenElse</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LRuleTyTmVar</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RuleTyTmVar</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkRuleBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkRuleTyVarBndrs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkRuleTyVarBndrNames</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="94" 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="92" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -94,14 +92,6 @@ module RdrHsSyn (</td>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdI</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ecFromExp</span><span class="p">,</span></span>
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<td class="diff-line-num new_line" data-linenumber="94" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ecFromCmd</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC97" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ecHsLam</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ecHsLet</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ecOpApp</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC100" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ecHsCase</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ecHsApp</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ecHsIf</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC103" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ecHsDo</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC104" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ecHsPar</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC97" 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">@@ -1004,8 +994,9 @@ checkTyClHdr is_cls ty</td>
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<pre style="margin: 0;"> <span id="LC994" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC995" class="line" lang="haskell"><span class="cd">-- | Yield a parse error if we have a function applied directly to a do block</span></span>
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<pre style="margin: 0;"> <span id="LC996" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- etc. and BlockArguments is not enabled.</span></span>
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<pre style="margin: 0;">-<span id="LC1007" class="line" lang="haskell"><span class="n" style="color: #333;">checkBlockArguments</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">ExpCmdI</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="p">(</span><span class="n" style="color: #333;">b</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;">PV</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1008
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<pre style="margin: 0;">-<span id="LC1008" class="line" lang="haskell"><span class="n" style="color: #333;">checkBlockArguments</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ExpG</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">checkExpr</span><span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">checkCmd</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC997" class="line" lang="haskell"><span class="n" style="color: #333;">checkExpBlockArguments</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;">P</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC998" class="line" lang="haskell"><span class="n" style="color: #333;">checkCmdBlockArguments</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsCmd</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;">P</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC999" class="line" lang="haskell"><span class="p">(</span><span class="n" style="color: #333;">checkExpBlockArguments</span><span class="p">,</span> <span class="n" style="color: #333;">checkCmdBlockArguments</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">checkExpr</span><span class="p">,</span> <span class="n" style="color: #333;">checkCmd</span><span class="p">)</span></span>
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1009
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1000
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<pre style="margin: 0;"> <span id="LC1000" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1010
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1001
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<pre style="margin: 0;"> <span id="LC1001" class="line" lang="haskell"> <span class="n" style="color: #333;">checkExpr</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;">P</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1011
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1002
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<pre style="margin: 0;"> <span id="LC1002" class="line" lang="haskell"> <span class="n" style="color: #333;">checkExpr</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">expr</span> <span class="kr" style="font-weight: 600;">of</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">@@ -1315,19 +1306,6 @@ checkValSigLhs lhs@(dL->L l _)</td>
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<pre style="margin: 0;"> <span id="LC1306" class="line" lang="haskell"> <span class="n" style="color: #333;">default_RDR</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkUnqual</span> <span class="n" style="color: #333;">varName</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"default"</span><span class="p">)</span></span>
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1307
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<pre style="margin: 0;"> <span id="LC1307" class="line" lang="haskell"> <span class="n" style="color: #333;">pattern_RDR</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkUnqual</span> <span class="n" style="color: #333;">varName</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"pattern"</span><span class="p">)</span></span>
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1308
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<pre style="margin: 0;"> <span id="LC1308" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1318" class="line" lang="haskell"><span class="n" style="color: #333;">checkDoAndIfThenElse</span></span>
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1319
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<pre style="margin: 0;">-<span id="LC1319" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">ExpCmdI</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=></span></span>
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1320
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<pre style="margin: 0;">-<span id="LC1320" class="line" lang="haskell"> <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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1321
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<pre style="margin: 0;">-<span id="LC1321" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1322
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<pre style="margin: 0;">-<span id="LC1322" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">)</span></span>
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1323
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<pre style="margin: 0;">-<span id="LC1323" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1324
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<pre style="margin: 0;">-<span id="LC1324" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">)</span></span>
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1325
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<pre style="margin: 0;">-<span id="LC1325" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1326
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<pre style="margin: 0;">-<span id="LC1326" class="line" lang="haskell"><span class="n" style="color: #333;">checkDoAndIfThenElse</span> <span class="o" style="font-weight: 600;">=</span></span>
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1327
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<pre style="margin: 0;">-<span id="LC1327" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1328
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<pre style="margin: 0;">-<span id="LC1328" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ExpG</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">checkDoAndIfThenElse'</span></span>
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<pre style="margin: 0;">-<span id="LC1329" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">checkDoAndIfThenElse'</span></span>
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<pre style="margin: 0;">-<span id="LC1330" class="line" lang="haskell"></span>
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1309
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<pre style="margin: 0;"> <span id="LC1309" class="line" lang="haskell"><span class="n" style="color: #333;">checkDoAndIfThenElse'</span></span>
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1310
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<pre style="margin: 0;"> <span id="LC1310" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HasSrcSpan</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HasSrcSpan</span> <span class="n" style="color: #333;">c</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">c</span><span class="p">)</span></span>
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1333
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1311
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<pre style="margin: 0;"> <span id="LC1311" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></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;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="nb" style="color: #0086b3;">()</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">@@ -1924,73 +1902,78 @@ checkMonadComp = do</td>
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1924
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1902
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<pre style="margin: 0;"> <span id="LC1902" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdP</span> <span class="o" style="font-weight: 600;">=</span></span>
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1925
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1903
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<pre style="margin: 0;"> <span id="LC1903" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdP</span> <span class="p">{</span> <span class="n" style="color: #333;">runExpCmdP</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">ExpCmdI</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="p">(</span><span class="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">))</span> <span class="p">}</span></span>
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1926
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1904
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<pre style="margin: 0;"> <span id="LC1904" class="line" lang="haskell"></span>
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1927
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<pre style="margin: 0;">-<span id="LC1927" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Ambiguous syntactic categories]</span></span>
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1928
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<pre style="margin: 0;">-<span id="LC1928" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdG</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1929
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<pre style="margin: 0;">-<span id="LC1929" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ExpG</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdG</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span></span>
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1930
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<pre style="margin: 0;">-<span id="LC1930" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdG</span> <span class="kt" style="color: #458; font-weight: 600;">HsCmd</span></span>
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1931
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<pre style="margin: 0;">-<span id="LC1931" class="line" lang="haskell"></span>
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1932
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<pre style="margin: 0;">-<span id="LC1932" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Ambiguous syntactic categories]</span></span>
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1933
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<pre style="margin: 0;">-<span id="LC1933" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdI</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdG</span> <span class="n" style="color: #333;">b</span></span>
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1934
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<pre style="margin: 0;">-<span id="LC1934" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdI</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExpG</span></span>
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1935
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<pre style="margin: 0;">-<span id="LC1935" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdI</span> <span class="kt" style="color: #458; font-weight: 600;">HsCmd</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span></span>
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1936
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<pre style="margin: 0;">-<span id="LC1936" class="line" lang="haskell"></span>
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1937
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<pre style="margin: 0;">-<span id="LC1937" class="line" lang="haskell"><span class="n" style="color: #333;">ecFromCmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsCmd</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;">ExpCmdP</span></span>
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1938
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<pre style="margin: 0;">-<span id="LC1938" class="line" lang="haskell"><span class="n" style="color: #333;">ecFromCmd</span> <span class="n" style="color: #333;">c</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdP</span> <span class="n" style="color: #333;">onB</span></span>
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1939
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<pre style="margin: 0;">-<span id="LC1939" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1940
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<pre style="margin: 0;">-<span id="LC1940" class="line" lang="haskell"> <span class="n" style="color: #333;">onB</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">ExpCmdI</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="p">(</span><span class="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">))</span></span>
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1941
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<pre style="margin: 0;">-<span id="LC1941" class="line" lang="haskell"> <span class="n" style="color: #333;">onB</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ExpG</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">onExp</span><span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">c</span> <span class="p">}</span></span>
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1942
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<pre style="margin: 0;">-<span id="LC1942" class="line" lang="haskell"> <span class="n" style="color: #333;">onExp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">P</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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1943
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<pre style="margin: 0;">-<span id="LC1943" class="line" lang="haskell"> <span class="n" style="color: #333;">onExp</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1944
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<pre style="margin: 0;">-<span id="LC1944" class="line" lang="haskell"> <span class="n" style="color: #333;">addError</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span></span>
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1945
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<pre style="margin: 0;">-<span id="LC1945" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Arrow command found where an expression was expected:"</span><span class="p">,</span></span>
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1946
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<pre style="margin: 0;">-<span id="LC1946" 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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1947
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<pre style="margin: 0;">-<span id="LC1947" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">cL</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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1948
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<pre style="margin: 0;">-<span id="LC1948" class="line" lang="haskell"></span>
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1949
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1905
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<pre style="margin: 0;"> <span id="LC1905" class="line" lang="haskell"><span class="n" style="color: #333;">ecFromExp</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;">ExpCmdP</span></span>
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1950
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<pre style="margin: 0;">-<span id="LC1950" class="line" lang="haskell"><span class="n" style="color: #333;">ecFromExp</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdP</span> <span class="n" style="color: #333;">onB</span></span>
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1951
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<pre style="margin: 0;">-<span id="LC1951" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1952
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<pre style="margin: 0;">-<span id="LC1952" class="line" lang="haskell"> <span class="n" style="color: #333;">onB</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">ExpCmdI</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="p">(</span><span class="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">))</span></span>
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1953
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<pre style="margin: 0;">-<span id="LC1953" class="line" lang="haskell"> <span class="n" style="color: #333;">onB</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ExpG</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">e</span><span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">onCmd</span> <span class="p">}</span></span>
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1954
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<pre style="margin: 0;">-<span id="LC1954" class="line" lang="haskell"> <span class="n" style="color: #333;">onCmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsCmd</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">)</span></span>
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1955
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<pre style="margin: 0;">-<span id="LC1955" class="line" lang="haskell"> <span class="n" style="color: #333;">onCmd</span> <span class="o" style="font-weight: 600;">=</span></span>
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1956
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<pre style="margin: 0;">-<span id="LC1956" 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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1957
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<pre style="margin: 0;">-<span id="LC1957" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Parse error in command:"</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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1906
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<pre style="margin: 0;">+<span id="LC1906" class="line" lang="haskell"><span class="n" style="color: #333;">ecFromExp</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdP</span> <span class="p">(</span><span class="n" style="color: #333;">ecFromExp'</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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1958
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1907
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<pre style="margin: 0;"> <span id="LC1907" class="line" lang="haskell"></span>
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1959
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<pre style="margin: 0;">-<span id="LC1959" class="line" lang="haskell"><span class="n" style="color: #333;">hsHoleExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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1960
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<pre style="margin: 0;">-<span id="LC1960" class="line" lang="haskell"><span class="n" style="color: #333;">hsHoleExpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsUnboundVar</span> <span class="n" style="color: #333;">noExt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TrueExprHole</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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1961
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<pre style="margin: 0;">-<span id="LC1961" class="line" lang="haskell"></span>
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1962
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<pre style="margin: 0;">-<span id="LC1962" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsLam</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">ExpCmdI</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;">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="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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1963
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<pre style="margin: 0;">-<span id="LC1963" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsLam</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ExpG</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;">noExt</span><span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdLam</span> <span class="n" style="color: #333;">noExt</span> <span class="p">}</span></span>
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1964
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<pre style="margin: 0;">-<span id="LC1964" class="line" lang="haskell"></span>
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1965
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<pre style="margin: 0;">-<span id="LC1965" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsLet</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">ExpCmdI</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;">LHsLocalBinds</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="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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1966
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<pre style="margin: 0;">-<span id="LC1966" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsLet</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ExpG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsLet</span> <span class="n" style="color: #333;">noExt</span><span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdLet</span> <span class="n" style="color: #333;">noExt</span> <span class="p">}</span></span>
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1908
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<pre style="margin: 0;">+<span id="LC1908" class="line" lang="haskell"><span class="n" style="color: #333;">ecFromCmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsCmd</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;">ExpCmdP</span></span>
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1909
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<pre style="margin: 0;">+<span id="LC1909" class="line" lang="haskell"><span class="n" style="color: #333;">ecFromCmd</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdP</span> <span class="p">(</span><span class="n" style="color: #333;">ecFromCmd'</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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1967
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1910
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<pre style="margin: 0;"> <span id="LC1910" class="line" lang="haskell"></span>
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1968
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<pre style="margin: 0;">-<span id="LC1968" class="line" lang="haskell"><span class="n" style="color: #333;">ecOpApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">ExpCmdI</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="p">(</span><span class="n" style="color: #333;">b</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;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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1969
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<pre style="margin: 0;">-<span id="LC1969" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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1970
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<pre style="margin: 0;">-<span id="LC1970" class="line" lang="haskell"><span class="n" style="color: #333;">ecOpApp</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ExpG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OpApp</span> <span class="n" style="color: #333;">noExt</span><span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">cmdOpApp</span> <span class="p">}</span></span>
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1971
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<pre style="margin: 0;">-<span id="LC1971" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1972
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<pre style="margin: 0;">-<span id="LC1972" class="line" lang="haskell"> <span class="n" style="color: #333;">cmdOpApp</span> <span class="n" style="color: #333;">c1</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">c2</span> <span class="o" style="font-weight: 600;">=</span></span>
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1911
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<pre style="margin: 0;">+<span id="LC1911" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Ambiguous syntactic categories]</span></span>
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1912
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<pre style="margin: 0;">+<span id="LC1912" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdI</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1913" 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">
1913
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<pre style="margin: 0;">+<span id="LC1913" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Return a command without ambiguity, or fail in a non-command context.</span></span>
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1914
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<pre style="margin: 0;">+<span id="LC1914" class="line" lang="haskell"> <span class="n" style="color: #333;">ecFromCmd'</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsCmd</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="p">(</span><span class="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">))</span></span>
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1915
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<pre style="margin: 0;">+<span id="LC1915" 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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<td class="diff-line-num new new_line" data-linenumber="1916" 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">
1916
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<pre style="margin: 0;">+<span id="LC1916" class="line" lang="haskell"> <span class="n" style="color: #333;">ecFromExp'</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="p">(</span><span class="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">))</span></span>
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1917
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<pre style="margin: 0;">+<span id="LC1917" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Disambiguate "\... -> ..." (lambda)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1918" 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">
1918
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<pre style="margin: 0;">+<span id="LC1918" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsLam</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="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1919" 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">
1919
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<pre style="margin: 0;">+<span id="LC1919" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Disambiguate "let ... in ..."</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1920" 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">
1920
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<pre style="margin: 0;">+<span id="LC1920" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsLet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsLocalBinds</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="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1921" 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">
1921
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<pre style="margin: 0;">+<span id="LC1921" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Disambiguate "f # x" (infix operator)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1922" 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">
1922
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<pre style="margin: 0;">+<span id="LC1922" class="line" lang="haskell"> <span class="n" style="color: #333;">ecOpApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">b</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;">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="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1923" 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">
1923
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<pre style="margin: 0;">+<span id="LC1923" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Disambiguate "case ... of ..."</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1924" 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">
1924
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<pre style="margin: 0;">+<span id="LC1924" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsCase</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;">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="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1925" 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">
1925
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<pre style="margin: 0;">+<span id="LC1925" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Disambiguate "f x" (function application)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1926" 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">
1926
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<pre style="margin: 0;">+<span id="LC1926" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">b</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;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1927" 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">
1927
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<pre style="margin: 0;">+<span id="LC1927" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Disambiguate "if ... then ... else ..."</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1928" 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">
1928
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<pre style="margin: 0;">+<span id="LC1928" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsIf</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="p">(</span><span class="n" style="color: #333;">b</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="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1929" 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">
1929
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<pre style="margin: 0;">+<span id="LC1929" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Disambiguate "do { ... }" (do notation)</span></span>
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1930
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<pre style="margin: 0;">+<span id="LC1930" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsDo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LStmt</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="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="1931" 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">
1931
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<pre style="margin: 0;">+<span id="LC1931" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Disambiguate "( ... )" (parentheses)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1932" 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">
1932
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<pre style="margin: 0;">+<span id="LC1932" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsPar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
</pre>
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1933
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<pre style="margin: 0;">+<span id="LC1933" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Check if the argument requires -XBlockArguments.</span></span>
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1934
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<pre style="margin: 0;">+<span id="LC1934" class="line" lang="haskell"> <span class="n" style="color: #333;">checkBlockArguments</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">b</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;">PV</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1935
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<pre style="margin: 0;">+<span id="LC1935" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Check if -XDoAndIfThenElse is enabled.</span></span>
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1936
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<pre style="margin: 0;">+<span id="LC1936" class="line" lang="haskell"> <span class="n" style="color: #333;">checkDoAndIfThenElse</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;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">)</span></span>
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1937
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<pre style="margin: 0;">+<span id="LC1937" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">b</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;">P</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1938
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<pre style="margin: 0;">+<span id="LC1938" class="line" lang="haskell"></span>
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1939
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<pre style="margin: 0;">+<span id="LC1939" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdI</span> <span class="kt" style="color: #458; font-weight: 600;">HsCmd</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1940
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<pre style="margin: 0;">+<span id="LC1940" class="line" lang="haskell"> <span class="n" style="color: #333;">ecFromCmd'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span></span>
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1941
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<pre style="margin: 0;">+<span id="LC1941" class="line" lang="haskell"> <span class="n" style="color: #333;">ecFromExp'</span> <span class="p">(</span><span class="n" style="color: #333;">dL</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="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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1942
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<pre style="margin: 0;">+<span id="LC1942" 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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1943
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<pre style="margin: 0;">+<span id="LC1943" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Parse error in command:"</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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1944
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<pre style="margin: 0;">+<span id="LC1944" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsLam</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdLam</span> <span class="n" style="color: #333;">noExt</span></span>
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1945
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<pre style="margin: 0;">+<span id="LC1945" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsLet</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdLet</span> <span class="n" style="color: #333;">noExt</span></span>
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1946
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<pre style="margin: 0;">+<span id="LC1946" class="line" lang="haskell"> <span class="n" style="color: #333;">ecOpApp</span> <span class="n" style="color: #333;">c1</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">c2</span> <span class="o" style="font-weight: 600;">=</span></span>
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1973
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1947
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<pre style="margin: 0;"> <span id="LC1947" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">cmdArg</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cL</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdTop</span> <span class="n" style="color: #333;">noExt</span> <span class="n" style="color: #333;">c</span> <span class="kr" style="font-weight: 600;">in</span></span>
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1974
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1948
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<pre style="margin: 0;"> <span id="LC1948" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsCmdArrForm</span> <span class="n" style="color: #333;">noExt</span> <span class="n" style="color: #333;">op</span> <span class="kt" style="color: #458; font-weight: 600;">Infix</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">[</span><span class="n" style="color: #333;">cmdArg</span> <span class="n" style="color: #333;">c1</span><span class="p">,</span> <span class="n" style="color: #333;">cmdArg</span> <span class="n" style="color: #333;">c2</span><span class="p">]</span></span>
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1949
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<pre style="margin: 0;">+<span id="LC1949" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsCase</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdCase</span> <span class="n" style="color: #333;">noExt</span></span>
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1950
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<pre style="margin: 0;">+<span id="LC1950" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsApp</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdApp</span> <span class="n" style="color: #333;">noExt</span></span>
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1951
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<pre style="margin: 0;">+<span id="LC1951" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsIf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkHsCmdIf</span></span>
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1952
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<pre style="margin: 0;">+<span id="LC1952" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsDo</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdDo</span> <span class="n" style="color: #333;">noExt</span></span>
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1953
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<pre style="margin: 0;">+<span id="LC1953" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsPar</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdPar</span> <span class="n" style="color: #333;">noExt</span></span>
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1954
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<pre style="margin: 0;">+<span id="LC1954" class="line" lang="haskell"> <span class="n" style="color: #333;">checkBlockArguments</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">checkCmdBlockArguments</span></span>
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1955
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<pre style="margin: 0;">+<span id="LC1955" class="line" lang="haskell"> <span class="n" style="color: #333;">checkDoAndIfThenElse</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">checkDoAndIfThenElse'</span></span>
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1956
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<pre style="margin: 0;">+<span id="LC1956" class="line" lang="haskell"></span>
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1957
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<pre style="margin: 0;">+<span id="LC1957" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">ExpCmdI</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1958
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<pre style="margin: 0;">+<span id="LC1958" class="line" lang="haskell"> <span class="n" style="color: #333;">ecFromCmd'</span> <span class="p">(</span><span class="n" style="color: #333;">dL</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="n" style="color: #333;">c</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1959
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<pre style="margin: 0;">+<span id="LC1959" class="line" lang="haskell"> <span class="n" style="color: #333;">addError</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span></span>
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1960
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<pre style="margin: 0;">+<span id="LC1960" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Arrow command found where an expression was expected:"</span><span class="p">,</span></span>
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1961
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<pre style="margin: 0;">+<span id="LC1961" 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>
</pre>
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1962
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<pre style="margin: 0;">+<span id="LC1962" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">cL</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">hsHoleExpr</span><span class="p">)</span></span>
</pre>
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1963
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<pre style="margin: 0;">+<span id="LC1963" class="line" lang="haskell"> <span class="n" style="color: #333;">ecFromExp'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span></span>
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1964
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<pre style="margin: 0;">+<span id="LC1964" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsLam</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;">noExt</span></span>
</pre>
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1965
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<pre style="margin: 0;">+<span id="LC1965" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsLet</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsLet</span> <span class="n" style="color: #333;">noExt</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="1966" 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">
1966
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<pre style="margin: 0;">+<span id="LC1966" class="line" lang="haskell"> <span class="n" style="color: #333;">ecOpApp</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OpApp</span> <span class="n" style="color: #333;">noExt</span></span>
</pre>
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1967
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<pre style="margin: 0;">+<span id="LC1967" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsCase</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsCase</span> <span class="n" style="color: #333;">noExt</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="1968" 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">
1968
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<pre style="margin: 0;">+<span id="LC1968" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsApp</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsApp</span> <span class="n" style="color: #333;">noExt</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="1969" 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">
1969
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<pre style="margin: 0;">+<span id="LC1969" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsIf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkHsIf</span></span>
</pre>
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1970
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<pre style="margin: 0;">+<span id="LC1970" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsDo</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsDo</span> <span class="n" style="color: #333;">noExt</span> <span class="kt" style="color: #458; font-weight: 600;">DoExpr</span></span>
</pre>
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1971
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<pre style="margin: 0;">+<span id="LC1971" class="line" lang="haskell"> <span class="n" style="color: #333;">ecHsPar</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsPar</span> <span class="n" style="color: #333;">noExt</span></span>
</pre>
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1972
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<pre style="margin: 0;">+<span id="LC1972" class="line" lang="haskell"> <span class="n" style="color: #333;">checkBlockArguments</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">checkExpBlockArguments</span></span>
</pre>
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1973
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<pre style="margin: 0;">+<span id="LC1973" class="line" lang="haskell"> <span class="n" style="color: #333;">checkDoAndIfThenElse</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">checkDoAndIfThenElse'</span></span>
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1975
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<td class="diff-line-num new_line" data-linenumber="1974" 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">
1974
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<pre style="margin: 0;"> <span id="LC1974" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1976" 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">
1976
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1976" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsCase</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">ExpCmdI</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=></span></span>
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<td class="diff-line-num old old_line" data-linenumber="1977" 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">
1977
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1977" class="line" lang="haskell"> <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;">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="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1978" 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">
1978
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1978" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsCase</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ExpG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsCase</span> <span class="n" style="color: #333;">noExt</span><span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdCase</span> <span class="n" style="color: #333;">noExt</span> <span class="p">}</span></span>
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1979
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1979" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1980" 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">
1980
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1980" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">ExpCmdI</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=></span></span>
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<td class="diff-line-num old old_line" data-linenumber="1981" 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">
1981
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1981" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">b</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;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1982" 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">
1982
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1982" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsApp</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ExpG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsApp</span> <span class="n" style="color: #333;">noExt</span><span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdApp</span> <span class="n" style="color: #333;">noExt</span> <span class="p">}</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1983" 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">
1983
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1983" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1984" 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">
1984
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1984" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsIf</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">ExpCmdI</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=></span></span>
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<td class="diff-line-num old old_line" data-linenumber="1985" 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">
1985
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1985" class="line" lang="haskell"> <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="p">(</span><span class="n" style="color: #333;">b</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="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1986" 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">
1986
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1986" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsIf</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ExpG</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkHsIf</span><span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkHsCmdIf</span> <span class="p">}</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1987" 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">
1987
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1987" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1988" 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">
1988
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1988" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsDo</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">ExpCmdI</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=></span></span>
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<td class="diff-line-num old old_line" data-linenumber="1989" 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">
1989
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1989" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LStmt</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="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1990" 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">
1990
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1990" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsDo</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ExpG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsDo</span> <span class="n" style="color: #333;">noExt</span> <span class="kt" style="color: #458; font-weight: 600;">DoExpr</span><span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdDo</span> <span class="n" style="color: #333;">noExt</span> <span class="p">}</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1991" 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">
1991
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<pre style="margin: 0;">-<span id="LC1991" class="line" lang="haskell"></span>
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1992
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1992" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsPar</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">ExpCmdI</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="p">(</span><span class="n" style="color: #333;">b</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="n" style="color: #333;">b</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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1993
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<td class="diff-line-num new_line old" data-linenumber="1975" 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="LC1993" class="line" lang="haskell"><span class="n" style="color: #333;">ecHsPar</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">expCmdG</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ExpG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsPar</span> <span class="n" style="color: #333;">noExt</span><span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">CmdG</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdPar</span> <span class="n" style="color: #333;">noExt</span> <span class="p">}</span></span>
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1975
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<pre style="margin: 0;">+<span id="LC1975" class="line" lang="haskell"><span class="n" style="color: #333;">hsHoleExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1976" 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">
1976
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<pre style="margin: 0;">+<span id="LC1976" class="line" lang="haskell"><span class="n" style="color: #333;">hsHoleExpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsUnboundVar</span> <span class="n" style="color: #333;">noExt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TrueExprHole</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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1994
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1977
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<pre style="margin: 0;"> <span id="LC1977" class="line" lang="haskell"></span>
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1995
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1978
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<pre style="margin: 0;"> <span id="LC1978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Ambiguous syntactic categories]</span></span>
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1996
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1979
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<pre style="margin: 0;"> <span id="LC1979" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2043" 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="2026" 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">@@ -2043,19 +2026,12 @@ we decided against, see Note [Resolving parsing ambiguities: non-taken alternati</td>
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2043
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2026
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<pre style="margin: 0;"> <span id="LC2026" class="line" lang="haskell"></span>
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2044
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2027
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<pre style="margin: 0;"> <span id="LC2027" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The solution that keeps basic definitions (such as HsExpr) clean, keeps the</span></span>
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2045
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2028
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<pre style="margin: 0;"> <span id="LC2028" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">concerns local to the parser, and does not require duplication of hsSyn types,</span></span>
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2046
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<pre style="margin: 0;">-<span id="LC2046" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">or an extra pass over the entire AST, is to parse into a function from a GADT</span></span>
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2047
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<pre style="margin: 0;">-<span id="LC2047" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to a parser-validator:</span></span>
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2048
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<pre style="margin: 0;">-<span id="LC2048" class="line" lang="haskell"></span>
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2049
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<pre style="margin: 0;">-<span id="LC2049" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data ExpCmdG b where</span></span>
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2050
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<pre style="margin: 0;">-<span id="LC2050" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ExpG :: ExpCmdG HsExpr</span></span>
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2051
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<pre style="margin: 0;">-<span id="LC2051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> CmdG :: ExpCmdG HsCmd</span></span>
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2052
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<pre style="margin: 0;">-<span id="LC2052" class="line" lang="haskell"></span>
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2053
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<pre style="margin: 0;">-<span id="LC2053" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type ExpCmd = forall b. ExpCmdG b -> PV (Located (b GhcPs))</span></span>
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2029
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<pre style="margin: 0;">+<span id="LC2029" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">or an extra pass over the entire AST, is to parse into an overloaded</span></span>
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2030
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<pre style="margin: 0;">+<span id="LC2030" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">parser-validator (a so-called tagless final encoding):</span></span>
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2054
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2031
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<pre style="margin: 0;"> <span id="LC2031" class="line" lang="haskell"></span>
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2055
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<pre style="margin: 0;">-<span id="LC2055" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> checkExp :: ExpCmd -> PV (LHsExpr GhcPs)</span></span>
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2056
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<pre style="margin: 0;">-<span id="LC2056" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> checkCmd :: ExpCmd -> PV (LHsCmd GhcPs)</span></span>
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2057
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<pre style="margin: 0;">-<span id="LC2057" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> checkExp f = f ExpG -- interpret as an expression</span></span>
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2058
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<pre style="margin: 0;">-<span id="LC2058" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> checkCmd f = f CmdG -- interpret as a command</span></span>
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2032
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<pre style="margin: 0;">+<span id="LC2032" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class ExpCmdI b where ...</span></span>
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2033
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<pre style="margin: 0;">+<span id="LC2033" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance ExpCmdI HsCmd where ...</span></span>
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2034
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<pre style="margin: 0;">+<span id="LC2034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance ExpCmdI HsExp where ...</span></span>
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2059
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2035
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<pre style="margin: 0;"> <span id="LC2035" class="line" lang="haskell"></span>
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2060
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2036
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<pre style="margin: 0;"> <span id="LC2036" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider the 'alts' production used to parse case-of alternatives:</span></span>
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2061
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2037
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<pre style="margin: 0;"> <span id="LC2037" 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">@@ -2065,30 +2041,6 @@ Consider the 'alts' production used to parse case-of alternatives:</td>
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2065
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2041
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<pre style="margin: 0;"> <span id="LC2041" class="line" lang="haskell"></span>
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2066
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2042
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<pre style="margin: 0;"> <span id="LC2042" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We abstract over LHsExpr, and it becomes:</span></span>
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2067
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2043
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<pre style="margin: 0;"> <span id="LC2043" class="line" lang="haskell"></span>
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2068
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<pre style="margin: 0;">-<span id="LC2068" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> alts :: { forall b. ExpCmdG b -> PV (Located ([AddAnn],[LMatch GhcPs (Located (b GhcPs))])) }</span></span>
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2069
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<pre style="margin: 0;">-<span id="LC2069" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> : alts1</span></span>
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2070
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<pre style="margin: 0;">-<span id="LC2070" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { \tag -> $1 tag >>= \ $1 -></span></span>
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2071
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<pre style="margin: 0;">-<span id="LC2071" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> return $ sL1 $1 (fst $ unLoc $1,snd $ unLoc $1) }</span></span>
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2072
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<pre style="margin: 0;">-<span id="LC2072" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | ';' alts</span></span>
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2073
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<pre style="margin: 0;">-<span id="LC2073" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { \tag -> $2 tag >>= \ $2 -></span></span>
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2074
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<pre style="margin: 0;">-<span id="LC2074" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> return $ sLL $1 $> ((mj AnnSemi $1:(fst $ unLoc $2)),snd $ unLoc $2) }</span></span>
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2075
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<pre style="margin: 0;">-<span id="LC2075" class="line" lang="haskell"></span>
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2076
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<pre style="margin: 0;">-<span id="LC2076" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that 'ExpCmdG' is a singleton type, the value is completely</span></span>
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2077
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<pre style="margin: 0;">-<span id="LC2077" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">determined by the type:</span></span>
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2078
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<pre style="margin: 0;">-<span id="LC2078" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2079" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when (b~HsExpr), tag = ExpG</span></span>
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<pre style="margin: 0;">-<span id="LC2080" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when (b~HsCmd), tag = CmdG</span></span>
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<pre style="margin: 0;">-<span id="LC2081" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2082" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is a clear indication that we can use a class to pass this value behind</span></span>
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<pre style="margin: 0;">-<span id="LC2083" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the scenes:</span></span>
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2084
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<pre style="margin: 0;">-<span id="LC2084" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2085" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class ExpCmdI b where expCmdG :: ExpCmdG b</span></span>
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<pre style="margin: 0;">-<span id="LC2086" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance ExpCmdI HsExpr where expCmdG = ExpG</span></span>
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2087
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<pre style="margin: 0;">-<span id="LC2087" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance ExpCmdI HsCmd where expCmdG = CmdG</span></span>
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<pre style="margin: 0;">-<span id="LC2088" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2089" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And now the 'alts' production is simplified, as we no longer need to</span></span>
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<pre style="margin: 0;">-<span id="LC2090" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">thread 'tag' explicitly:</span></span>
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<pre style="margin: 0;">-<span id="LC2091" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2044" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> alts :: { forall b. ExpCmdI b => PV (Located ([AddAnn],[LMatch GhcPs (Located (b GhcPs))])) }</span></span>
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<pre style="margin: 0;"> <span id="LC2045" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> : alts1 { $1 >>= \ $1 -></span></span>
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<pre style="margin: 0;"> <span id="LC2046" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> return $ sL1 $1 (fst $ unLoc $1,snd $ unLoc $1) }</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">@@ -2331,6 +2283,63 @@ each reduction rule:</td>
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<pre style="margin: 0;"> <span id="LC2283" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And the same goes for other productions: 'altslist', 'alts1', 'alt', 'alt_rhs',</span></span>
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<pre style="margin: 0;"> <span id="LC2284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'ralt', 'gdpats', 'gdpat', 'exp', ... and so on. That is a lot of code!</span></span>
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<pre style="margin: 0;"> <span id="LC2285" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2286" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Alternative VIII, a function from a GADT</span></span>
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<pre style="margin: 0;">+<span id="LC2287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">----------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC2288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We could avoid code duplication of the Alternative VII by representing the product</span></span>
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<pre style="margin: 0;">+<span id="LC2289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as a function from a GADT:</span></span>
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2290
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<pre style="margin: 0;">+<span id="LC2290" class="line" lang="haskell"></span>
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2291
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<pre style="margin: 0;">+<span id="LC2291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data ExpCmdG b where</span></span>
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2292
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<pre style="margin: 0;">+<span id="LC2292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ExpG :: ExpCmdG HsExpr</span></span>
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2293
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<pre style="margin: 0;">+<span id="LC2293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> CmdG :: ExpCmdG HsCmd</span></span>
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2294
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<pre style="margin: 0;">+<span id="LC2294" class="line" lang="haskell"></span>
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2295
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<pre style="margin: 0;">+<span id="LC2295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type ExpCmd = forall b. ExpCmdG b -> PV (Located (b GhcPs))</span></span>
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2296
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<pre style="margin: 0;">+<span id="LC2296" class="line" lang="haskell"></span>
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2297
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<pre style="margin: 0;">+<span id="LC2297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> checkExp :: ExpCmd -> PV (LHsExpr GhcPs)</span></span>
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2298
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<pre style="margin: 0;">+<span id="LC2298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> checkCmd :: ExpCmd -> PV (LHsCmd GhcPs)</span></span>
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2299
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<pre style="margin: 0;">+<span id="LC2299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> checkExp f = f ExpG -- interpret as an expression</span></span>
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2300
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<pre style="margin: 0;">+<span id="LC2300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> checkCmd f = f CmdG -- interpret as a command</span></span>
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2301
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<pre style="margin: 0;">+<span id="LC2301" class="line" lang="haskell"></span>
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2302
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<pre style="margin: 0;">+<span id="LC2302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider the 'alts' production used to parse case-of alternatives:</span></span>
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2303
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<pre style="margin: 0;">+<span id="LC2303" class="line" lang="haskell"></span>
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2304
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<pre style="margin: 0;">+<span id="LC2304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> alts :: { Located ([AddAnn],[LMatch GhcPs (LHsExpr GhcPs)]) }</span></span>
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2305
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<pre style="margin: 0;">+<span id="LC2305" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> : alts1 { sL1 $1 (fst $ unLoc $1,snd $ unLoc $1) }</span></span>
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2306
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<pre style="margin: 0;">+<span id="LC2306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | ';' alts { sLL $1 $> ((mj AnnSemi $1:(fst $ unLoc $2)),snd $ unLoc $2) }</span></span>
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2307
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<pre style="margin: 0;">+<span id="LC2307" class="line" lang="haskell"></span>
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2308
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<pre style="margin: 0;">+<span id="LC2308" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We abstract over LHsExpr, and it becomes:</span></span>
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2309
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<pre style="margin: 0;">+<span id="LC2309" class="line" lang="haskell"></span>
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2310
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<pre style="margin: 0;">+<span id="LC2310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> alts :: { forall b. ExpCmdG b -> PV (Located ([AddAnn],[LMatch GhcPs (Located (b GhcPs))])) }</span></span>
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2311
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<pre style="margin: 0;">+<span id="LC2311" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> : alts1</span></span>
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2312
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<pre style="margin: 0;">+<span id="LC2312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { \tag -> $1 tag >>= \ $1 -></span></span>
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2313
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<pre style="margin: 0;">+<span id="LC2313" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> return $ sL1 $1 (fst $ unLoc $1,snd $ unLoc $1) }</span></span>
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2314
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<pre style="margin: 0;">+<span id="LC2314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | ';' alts</span></span>
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2315
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<pre style="margin: 0;">+<span id="LC2315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { \tag -> $2 tag >>= \ $2 -></span></span>
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<td class="diff-line-num new new_line" data-linenumber="2316" 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">
2316
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<pre style="margin: 0;">+<span id="LC2316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> return $ sLL $1 $> ((mj AnnSemi $1:(fst $ unLoc $2)),snd $ unLoc $2) }</span></span>
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2317
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<pre style="margin: 0;">+<span id="LC2317" class="line" lang="haskell"></span>
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2318
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<pre style="margin: 0;">+<span id="LC2318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that 'ExpCmdG' is a singleton type, the value is completely</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2319" 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">
2319
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<pre style="margin: 0;">+<span id="LC2319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">determined by the type:</span></span>
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2320
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<pre style="margin: 0;">+<span id="LC2320" class="line" lang="haskell"></span>
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2321
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<pre style="margin: 0;">+<span id="LC2321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when (b~HsExpr), tag = ExpG</span></span>
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2322
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<pre style="margin: 0;">+<span id="LC2322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when (b~HsCmd), tag = CmdG</span></span>
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2323
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<pre style="margin: 0;">+<span id="LC2323" class="line" lang="haskell"></span>
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2324
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<pre style="margin: 0;">+<span id="LC2324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is a clear indication that we can use a class to pass this value behind</span></span>
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2325
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<pre style="margin: 0;">+<span id="LC2325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the scenes:</span></span>
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2326
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<pre style="margin: 0;">+<span id="LC2326" class="line" lang="haskell"></span>
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2327
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<pre style="margin: 0;">+<span id="LC2327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class ExpCmdI b where expCmdG :: ExpCmdG b</span></span>
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2328
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<pre style="margin: 0;">+<span id="LC2328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance ExpCmdI HsExpr where expCmdG = ExpG</span></span>
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2329
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<pre style="margin: 0;">+<span id="LC2329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance ExpCmdI HsCmd where expCmdG = CmdG</span></span>
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2330
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<pre style="margin: 0;">+<span id="LC2330" class="line" lang="haskell"></span>
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2331
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<pre style="margin: 0;">+<span id="LC2331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And now the 'alts' production is simplified, as we no longer need to</span></span>
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2332
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<pre style="margin: 0;">+<span id="LC2332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">thread 'tag' explicitly:</span></span>
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2333
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<pre style="margin: 0;">+<span id="LC2333" class="line" lang="haskell"></span>
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2334
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<pre style="margin: 0;">+<span id="LC2334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> alts :: { forall b. ExpCmdI b => PV (Located ([AddAnn],[LMatch GhcPs (Located (b GhcPs))])) }</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2335" 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">
2335
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<pre style="margin: 0;">+<span id="LC2335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> : alts1 { $1 >>= \ $1 -></span></span>
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<td class="diff-line-num new new_line" data-linenumber="2336" 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">
2336
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<pre style="margin: 0;">+<span id="LC2336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> return $ sL1 $1 (fst $ unLoc $1,snd $ unLoc $1) }</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2337" 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">
2337
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<pre style="margin: 0;">+<span id="LC2337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | ';' alts { $2 >>= \ $2 -></span></span>
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2338
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<pre style="margin: 0;">+<span id="LC2338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> return $ sLL $1 $> ((mj AnnSemi $1:(fst $ unLoc $2)),snd $ unLoc $2) }</span></span>
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2339
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<pre style="margin: 0;">+<span id="LC2339" class="line" lang="haskell"></span>
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2340
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<pre style="margin: 0;">+<span id="LC2340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This encoding works well enough for two cases (Exp vs Cmd), but it does not scale well to</span></span>
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2341
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<pre style="margin: 0;">+<span id="LC2341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">more cases (Exp vs Cmd vs Pat), as we would need multiple GADTs for all possible ambiguities.</span></span>
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2342
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<pre style="margin: 0;">+<span id="LC2342" class="line" lang="haskell"></span>
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2334
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2343
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<pre style="margin: 0;"> <span id="LC2343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2335
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2344
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<pre style="margin: 0;"> <span id="LC2344" class="line" lang="haskell"></span>
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2336
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2345
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<pre style="margin: 0;"> <span id="LC2345" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------------------------------------------------------------</span></span>
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