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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/3907ee01e68b383fa30386d163decf203acedb19">3907ee01</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-08-07T08:34:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">A fix to an error message in monad comprehensions, and a move of dsHandleMonadicFailure
as suggested by comments on !2330.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa9bb70a3fefef681cb0e80cc78977386c1dcf0a">fa9bb70a</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-08-07T08:34:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add some tests for fail messages in do-expressions and monad-comprehensions.
</pre>
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<h4>9 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#6bdd5abc649727f2a802bc96ce5c276de19d3726">
compiler/GHC/HsToCore/Expr.hs
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<li class="file-stats">
<a href="#0f81db91b67c3e47ac75aa942ac3aa080f676036">
compiler/GHC/HsToCore/Expr.hs-boot
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<li class="file-stats">
<a href="#912bb8ed70a132c8eb2e037f8c9ecb045d2c229c">
compiler/GHC/HsToCore/ListComp.hs
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<li class="file-stats">
<a href="#94864be2e2eb1959a038d5d903a6c784e5cfb32a">
compiler/GHC/HsToCore/Utils.hs
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<li class="file-stats">
<a href="#ede2065b0d7dd9d41dc050d94789bc97b1944952">
<span class="new-file">
+
testsuite/tests/deSugar/should_run/DsDoExprFailMsg.hs
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<a href="#ccffb0d46c5219382669044c0e664eabf3ef9e7c">
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testsuite/tests/deSugar/should_run/DsDoExprFailMsg.stderr
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<a href="#9dea82d6a8e9c7cefbb4301c0e8a1caab5d4c08f">
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+
testsuite/tests/deSugar/should_run/DsMonadCompFailMsg.hs
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<a href="#bd41a69563b8b136fd7a8aa8bfa2c6980c11291b">
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testsuite/tests/deSugar/should_run/DsMonadCompFailMsg.stderr
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<li class="file-stats">
<a href="#dd8561f0b2e04faceab592f6504b9c483c57484a">
testsuite/tests/deSugar/should_run/all.T
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<h4>Changes:</h4>
<li id="6bdd5abc649727f2a802bc96ce5c276de19d3726">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/9570c21295a2b4a1d1e40939869124f0b9b9bf91...fa9bb70a3fefef681cb0e80cc78977386c1dcf0a#6bdd5abc649727f2a802bc96ce5c276de19d3726"><strong>compiler/GHC/HsToCore/Expr.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="16" 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">@@ -16,7 +16,6 @@ Desugaring expressions.</td>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.HsToCore.Expr</span></span>
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<td class="diff-line-num old_line" data-linenumber="17" 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="LC17" class="line" lang="haskell"> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">dsExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dsLExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dsLExprNoLP</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dsLocalBinds</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="18" 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="LC18" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dsValBinds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dsLit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dsSyntaxExpr</span></span>
</pre>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dsHandleMonadicFailure</span></span>
</pre>
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20
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">where</span></span>
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21
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="989" 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="988" 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">@@ -989,7 +988,7 @@ dsDo ctx stmts</td>
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<td class="diff-line-num old_line" data-linenumber="989" 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">
989
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988
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<pre style="margin: 0;"> <span id="LC988" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">selectSimpleMatchVarL</span> <span class="p">(</span><span class="n" style="color: #333;">xbstc_boundResultMult</span> <span class="n" style="color: #333;">xbs</span><span class="p">)</span> <span class="n" style="color: #333;">pat</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="990" 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">
990
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<td class="diff-line-num new_line" data-linenumber="989" 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">
989
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<pre style="margin: 0;"> <span id="LC989" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">var</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="n" style="color: #333;">ctx</span><span class="p">)</span> <span class="n" style="color: #333;">pat</span></span>
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991
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990
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<pre style="margin: 0;"> <span id="LC990" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">xbstc_boundResultType</span> <span class="n" style="color: #333;">xbs</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">cantFailMatchResult</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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992
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<pre style="margin: 0;">-<span id="LC992" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_code</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">match</span> <span class="p">(</span><span class="n" style="color: #333;">xbstc_failOp</span> <span class="n" style="color: #333;">xbs</span><span class="p">)</span></span>
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<td class="diff-line-num new old_line" data-linenumber="993" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="991" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC991" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_code</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="n" style="color: #333;"><span class="idiff left">ctx</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">match</span> <span class="p">(</span><span class="n" style="color: #333;">xbstc_failOp</span> <span class="n" style="color: #333;">xbs</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="993" 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">
993
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992
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<pre style="margin: 0;"> <span id="LC992" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dsSyntaxExpr</span> <span class="p">(</span><span class="n" style="color: #333;">xbstc_bindOp</span> <span class="n" style="color: #333;">xbs</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">rhs'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">match_code</span><span class="p">]</span> <span class="p">}</span></span>
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994
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993
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<pre style="margin: 0;"> <span id="LC993" class="line" lang="haskell"></span>
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995
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994
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<pre style="margin: 0;"> <span id="LC994" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ApplicativeStmt</span> <span class="n" style="color: #333;">body_ty</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">mb_join</span><span class="p">)</span> <span class="n" style="color: #333;">stmts</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">@@ -1010,7 +1009,7 @@ dsDo ctx stmts</td>
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1009
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<pre style="margin: 0;"> <span id="LC1009" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">selectSimpleMatchVarL</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">pat</span></span>
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1011
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1010
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<pre style="margin: 0;"> <span id="LC1010" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">var</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="n" style="color: #333;">ctx</span><span class="p">)</span> <span class="n" style="color: #333;">pat</span></span>
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1012
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1011
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<pre style="margin: 0;"> <span id="LC1011" class="line" lang="haskell"> <span class="n" style="color: #333;">body_ty</span> <span class="p">(</span><span class="n" style="color: #333;">cantFailMatchResult</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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1013
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<pre style="margin: 0;">-<span id="LC1013" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_code</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">match</span> <span class="n" style="color: #333;">fail_op</span></span>
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1012
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_code</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="n" style="color: #333;"><span class="idiff left">ctx</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">match</span> <span class="n" style="color: #333;">fail_op</span></span>
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1013
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">var</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">vs</span><span class="p">,</span> <span class="n" style="color: #333;">match_code</span><span class="p">)</span></span>
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1014
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<pre style="margin: 0;"> <span id="LC1014" class="line" lang="haskell"> <span class="p">}</span></span>
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1015
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<pre style="margin: 0;"> <span id="LC1015" 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">@@ -1065,31 +1064,6 @@ dsDo ctx stmts</td>
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1065
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1064
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ParStmt</span> <span class="p">{})</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"dsDo ParStmt"</span></span>
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1066
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1065
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<pre style="margin: 0;"> <span id="LC1065" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TransStmt</span> <span class="p">{})</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"dsDo TransStmt"</span></span>
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1067
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1066
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<pre style="margin: 0;"> <span id="LC1066" class="line" lang="haskell"></span>
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1068
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<pre style="margin: 0;">-<span id="LC1068" class="line" lang="haskell"><span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MatchResult</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FailOperator</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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1069
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<pre style="margin: 0;">-<span id="LC1069" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In a do expression, pattern-match failure just calls</span></span>
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1070
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<pre style="margin: 0;">-<span id="LC1070" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the monadic 'fail' rather than throwing an exception</span></span>
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1071
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<pre style="margin: 0;">-<span id="LC1071" class="line" lang="haskell"><span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">match</span> <span class="n" style="color: #333;">m_fail_op</span> <span class="o" style="font-weight: 600;">=</span></span>
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1072
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<pre style="margin: 0;">-<span id="LC1072" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">shareFailureHandler</span> <span class="n" style="color: #333;">match</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1073
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<pre style="margin: 0;">-<span id="LC1073" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MR_Infallible</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">body</span></span>
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1074
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<pre style="margin: 0;">-<span id="LC1074" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MR_Fallible</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC1075" class="line" lang="haskell"> <span class="n" style="color: #333;">fail_op</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">m_fail_op</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC1076" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note that (non-monadic) list comprehension, pattern guards, etc could</span></span>
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<pre style="margin: 0;">-<span id="LC1077" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- have fallible bindings without an explicit failure op, but this is</span></span>
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1078
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<pre style="margin: 0;">-<span id="LC1078" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- handled elsewhere. See Note [Failing pattern matches in Stmts] the</span></span>
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1079
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<pre style="margin: 0;">-<span id="LC1079" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- breakdown of regular and special binds.</span></span>
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1080
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<pre style="margin: 0;">-<span id="LC1080" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"missing fail op"</span> <span class="o" style="font-weight: 600;">$</span></span>
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1081
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<pre style="margin: 0;">-<span id="LC1081" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Pattern match:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pat</span> <span class="o" style="font-weight: 600;"><+></span></span>
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1082
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<pre style="margin: 0;">-<span id="LC1082" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"is failable, and fail_expr was left unset"</span></span>
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1083
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<pre style="margin: 0;">-<span id="LC1083" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fail_op</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">fail_op</span></span>
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1084
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<pre style="margin: 0;">-<span id="LC1084" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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1085
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<pre style="margin: 0;">-<span id="LC1085" class="line" lang="haskell"> <span class="n" style="color: #333;">fail_msg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkStringExpr</span> <span class="p">(</span><span class="n" style="color: #333;">mk_fail_msg</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">pat</span><span class="p">)</span></span>
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1086
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<pre style="margin: 0;">-<span id="LC1086" class="line" lang="haskell"> <span class="n" style="color: #333;">fail_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsSyntaxExpr</span> <span class="n" style="color: #333;">fail_op</span> <span class="p">[</span><span class="n" style="color: #333;">fail_msg</span><span class="p">]</span></span>
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1087
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<pre style="margin: 0;">-<span id="LC1087" class="line" lang="haskell"> <span class="n" style="color: #333;">body</span> <span class="n" style="color: #333;">fail_expr</span></span>
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1088
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<pre style="margin: 0;">-<span id="LC1088" class="line" lang="haskell"></span>
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1089
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<pre style="margin: 0;">-<span id="LC1089" class="line" lang="haskell"><span class="n" style="color: #333;">mk_fail_msg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">String</span></span>
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1090
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<pre style="margin: 0;">-<span id="LC1090" class="line" lang="haskell"><span class="n" style="color: #333;">mk_fail_msg</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">pat</span> <span class="o" style="font-weight: 600;">=</span> <span class="s" style="color: #d14;">"Pattern match failure in do expression at "</span> <span class="o" style="font-weight: 600;">++</span></span>
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1091
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<pre style="margin: 0;">-<span id="LC1091" class="line" lang="haskell"> <span class="n" style="color: #333;">showPpr</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="n" style="color: #333;">pat</span><span class="p">)</span></span>
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1092
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<pre style="margin: 0;">-<span id="LC1092" class="line" lang="haskell"></span>
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1093
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<pre style="margin: 0;"> <span id="LC1067" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1068
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<pre style="margin: 0;"> <span id="LC1068" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1095
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1069
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<pre style="margin: 0;"> <span id="LC1069" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/9570c21295a2b4a1d1e40939869124f0b9b9bf91...fa9bb70a3fefef681cb0e80cc78977386c1dcf0a#0f81db91b67c3e47ac75aa942ac3aa080f676036"><strong>compiler/GHC/HsToCore/Expr.hs-boot</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.HsToCore.Expr</span> <span class="kr" style="font-weight: 600;">where</span></span>
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2
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span> <span class="p">(</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;">LHsExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsLocalBinds</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">LPat</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">SyntaxExpr</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">FailOperato</span>r</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.Monad</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MatchResult</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span> <span class="p">(</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;">LHsExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsLocalBinds</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">SyntaxExp</span>r</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.Monad</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">)</span></span>
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4
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="p">)</span></span>
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5
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs.Extension</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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6
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6
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="8" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -8,5 +8,3 @@ dsExpr :: HsExpr GhcTc -> DsM CoreExpr</td>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">dsLExpr</span><span class="p">,</span> <span class="n" style="color: #333;">dsLExprNoLP</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;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">dsSyntaxExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SyntaxExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">dsLocalBinds</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;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span></pre>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MatchResult</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FailOperator</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span></pre>
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<li id="912bb8ed70a132c8eb2e037f8c9ecb045d2c229c">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/9570c21295a2b4a1d1e40939869124f0b9b9bf91...fa9bb70a3fefef681cb0e80cc78977386c1dcf0a#912bb8ed70a132c8eb2e037f8c9ecb045d2c229c"><strong>compiler/GHC/HsToCore/ListComp.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="16" 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">@@ -16,7 +16,7 @@ module GHC.HsToCore.ListComp ( dsListComp, dsMonadComp ) where</td>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prelude</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">HsToCore</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Expr</span> <span class="p">(</span> <span class="n" style="color: #333;">ds<span class="idiff left">HandleMonadicFailure</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ds</span>Expr</span><span class="p">,</span> <span class="n" style="color: #333;">dsLExpr</span><span class="p">,</span> <span class="n" style="color: #333;">dsLExprNoLP</span><span class="p">,</span> <span class="n" style="color: #333;">dsLocalBinds</span><span class="p">,</span> <span class="n" style="color: #333;">dsSyntaxExpr</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">HsToCore</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Expr</span> <span class="p">(</span> <span class="n" style="color: #333;">dsExpr</span><span class="p">,</span> <span class="n" style="color: #333;">dsLExpr</span><span class="p">,</span> <span class="n" style="color: #333;">dsLExprNoLP</span><span class="p">,</span> <span class="n" style="color: #333;">dsLocalBinds</span><span class="p">,</span> <span class="n" style="color: #333;">dsSyntaxExpr</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Zonk</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">@@ -618,7 +618,7 @@ dsMcBindStmt pat rhs' bind_op fail_op res1_ty stmts</td>
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<pre style="margin: 0;"> <span id="LC618" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">selectSimpleMatchVarL</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">pat</span></span>
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619
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchSinglePatVar</span> <span class="n" style="color: #333;">var</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DoExpr</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">))</span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"> <span class="n" style="color: #333;">res1_ty</span> <span class="p">(</span><span class="n" style="color: #333;">cantFailMatchResult</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC621" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_code</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">match</span> <span class="n" style="color: #333;">fail_op</span></span>
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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">match_code</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MonadComp</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsStmtContext</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcRn</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">match</span> <span class="n" style="color: #333;">fail_op</span></span>
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<pre style="margin: 0;"> <span id="LC622" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dsSyntaxExpr</span> <span class="n" style="color: #333;">bind_op</span> <span class="p">[</span><span class="n" style="color: #333;">rhs'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">match_code</span><span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC623" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC624" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Desugar nested monad comprehensions, for example in `then..` constructs</span></span>
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<li id="94864be2e2eb1959a038d5d903a6c784e5cfb32a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/9570c21295a2b4a1d1e40939869124f0b9b9bf91...fa9bb70a3fefef681cb0e80cc78977386c1dcf0a#94864be2e2eb1959a038d5d903a6c784e5cfb32a"><strong>compiler/GHC/HsToCore/Utils.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">@@ -24,6 +24,7 @@ module GHC.HsToCore.Utils (</td>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractMatchResult</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">combineMatchResults</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">adjustMatchResultDs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">shareFailureHandler</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">dsHandleMonadicFailure</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkCoLetMatchResult</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkViewMatchResult</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkGuardedMatchResult</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchCanFail</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkEvalMatchResult</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkCoPrimCaseMatchResult</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCoAlgCaseMatchResult</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCoSynCaseMatchResult</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -49,7 +50,7 @@ module GHC.HsToCore.Utils (</td>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prelude</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">HsToCore</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Match</span> <span class="p">(</span> <span class="n" style="color: #333;">matchSimply</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">HsToCore</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Expr</span> <span class="p">(</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">HsToCore</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Expr</span> <span class="p">(</span> <span class="n" style="color: #333;">dsLExpr</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">dsSyntaxExpr</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Zonk</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">@@ -895,9 +896,33 @@ entered at most once. Adding a dummy 'realWorld' token argument makes</td>
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895
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<pre style="margin: 0;"> <span id="LC896" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it clear that sharing is not an issue. And that in turn makes it more</span></span>
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897
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<pre style="margin: 0;"> <span id="LC897" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CPR-friendly. This matters a lot: if you don't get it right, you lose</span></span>
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898
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<pre style="margin: 0;"> <span id="LC898" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the tail call property. For example, see #3403.</span></span>
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<pre style="margin: 0;">+<span id="LC899" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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900
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<pre style="margin: 0;"> <span id="LC900" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC901" class="line" lang="haskell"><span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IdP</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">HsStmtContext</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MatchResult</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FailOperator</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC902" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In a do expression, pattern-match failure just calls</span></span>
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<pre style="margin: 0;">+<span id="LC903" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the monadic 'fail' rather than throwing an exception</span></span>
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904
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<pre style="margin: 0;">+<span id="LC904" class="line" lang="haskell"><span class="n" style="color: #333;">dsHandleMonadicFailure</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">match</span> <span class="n" style="color: #333;">m_fail_op</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC905" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">shareFailureHandler</span> <span class="n" style="color: #333;">match</span> <span class="kr" style="font-weight: 600;">of</span></span>
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906
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<pre style="margin: 0;">+<span id="LC906" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MR_Infallible</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">body</span></span>
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<pre style="margin: 0;">+<span id="LC907" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MR_Fallible</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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908
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<pre style="margin: 0;">+<span id="LC908" class="line" lang="haskell"> <span class="n" style="color: #333;">fail_op</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">m_fail_op</span> <span class="kr" style="font-weight: 600;">of</span></span>
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909
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<pre style="margin: 0;">+<span id="LC909" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note that (non-monadic) list comprehension, pattern guards, etc could</span></span>
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910
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<pre style="margin: 0;">+<span id="LC910" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- have fallible bindings without an explicit failure op, but this is</span></span>
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911
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<pre style="margin: 0;">+<span id="LC911" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- handled elsewhere. See Note [Failing pattern matches in Stmts] the</span></span>
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912
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<pre style="margin: 0;">+<span id="LC912" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- breakdown of regular and special binds.</span></span>
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913
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<pre style="margin: 0;">+<span id="LC913" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"missing fail op"</span> <span class="o" style="font-weight: 600;">$</span></span>
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914
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<pre style="margin: 0;">+<span id="LC914" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Pattern match:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pat</span> <span class="o" style="font-weight: 600;"><+></span></span>
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915
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<pre style="margin: 0;">+<span id="LC915" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"is failable, and fail_expr was left unset"</span></span>
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916
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<pre style="margin: 0;">+<span id="LC916" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fail_op</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">fail_op</span></span>
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917
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<pre style="margin: 0;">+<span id="LC917" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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918
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<pre style="margin: 0;">+<span id="LC918" class="line" lang="haskell"> <span class="n" style="color: #333;">fail_msg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkStringExpr</span> <span class="p">(</span><span class="n" style="color: #333;">mk_fail_msg</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">pat</span><span class="p">)</span></span>
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919
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="haskell"> <span class="n" style="color: #333;">fail_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsSyntaxExpr</span> <span class="n" style="color: #333;">fail_op</span> <span class="p">[</span><span class="n" style="color: #333;">fail_msg</span><span class="p">]</span></span>
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920
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<pre style="margin: 0;">+<span id="LC920" class="line" lang="haskell"> <span class="n" style="color: #333;">body</span> <span class="n" style="color: #333;">fail_expr</span></span>
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921
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<pre style="margin: 0;">+<span id="LC921" class="line" lang="haskell"></span>
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922
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<pre style="margin: 0;">+<span id="LC922" class="line" lang="haskell"><span class="n" style="color: #333;">mk_fail_msg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IdP</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsStmtContext</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">String</span></span>
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923
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<pre style="margin: 0;">+<span id="LC923" class="line" lang="haskell"><span class="n" style="color: #333;">mk_fail_msg</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">pat</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">showPpr</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Pattern match failure in"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprStmtContext</span> <span class="n" style="color: #333;">ctx</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"at"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="n" style="color: #333;">pat</span><span class="p">)</span></span>
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924
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"></span>
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900
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<pre style="margin: 0;">-<span id="LC900" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">***</span>*********************************************************************</span></span>
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925
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<pre style="margin: 0;">+<span id="LC925" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">{- </span>*********************************************************************</span></span>
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926
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<pre style="margin: 0;"> <span id="LC926" 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="LC927" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Ticks</span></span>
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<pre style="margin: 0;"> <span id="LC928" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/9570c21295a2b4a1d1e40939869124f0b9b9bf91...fa9bb70a3fefef681cb0e80cc78977386c1dcf0a#ede2065b0d7dd9d41dc050d94789bc97b1944952"><strong>testsuite/tests/deSugar/should_run/DsDoExprFailMsg.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/9570c21295a2b4a1d1e40939869124f0b9b9bf91...fa9bb70a3fefef681cb0e80cc78977386c1dcf0a#ccffb0d46c5219382669044c0e664eabf3ef9e7c"><strong>testsuite/tests/deSugar/should_run/DsDoExprFailMsg.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">DsDoExprFailMsg: user error (Pattern match failure in 'do' block at DsDoExprFailMsg.hs:2:3-8)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/9570c21295a2b4a1d1e40939869124f0b9b9bf91...fa9bb70a3fefef681cb0e80cc78977386c1dcf0a#9dea82d6a8e9c7cefbb4301c0e8a1caab5d4c08f"><strong>testsuite/tests/deSugar/should_run/DsMonadCompFailMsg.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MonadComprehensions #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">]</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/9570c21295a2b4a1d1e40939869124f0b9b9bf91...fa9bb70a3fefef681cb0e80cc78977386c1dcf0a#bd41a69563b8b136fd7a8aa8bfa2c6980c11291b"><strong>testsuite/tests/deSugar/should_run/DsMonadCompFailMsg.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">DsMonadCompFailMsg: user error (Pattern match failure in monad comprehension at DsMonadCompFailMsg.hs:2:14-19)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/9570c21295a2b4a1d1e40939869124f0b9b9bf91...fa9bb70a3fefef681cb0e80cc78977386c1dcf0a#dd8561f0b2e04faceab592f6504b9c483c57484a"><strong>testsuite/tests/deSugar/should_run/all.T</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">@@ -66,3 +66,6 @@ test('T12595', normal, compile_and_run, [''])</td>
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66
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66
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T13285</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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67
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67
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18151</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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68
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68
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18172</span><span class="p">',</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">ghci_script</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T18172.script</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="perl"></span>
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70
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">DsDoExprFailMsg</span><span class="p">',</span> <span class="nv" style="color: #008080;">exit_code</span><span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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71
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">DsMonadCompFailMsg</span><span class="p">',</span> <span class="nv" style="color: #008080;">exit_code</span><span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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