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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/ac300a0d49343e6a558dc36d94fc558f51d43bb2">ac300a0d</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-10-14T12:05:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove "Operator sections" from docs/users_guide/bugs.rst
The issue described in that section was fixed by
2b89ca5b850b4097447cc4908cbb0631011ce979
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bf2411a3c198cb2df93a9e0aa0c3b8297f47058d">bf2411a3</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-10-14T12:05:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix PostfixOperators (#18151)
This fixes a regression introduced in 2b89ca5b850b4097447cc4908cbb0631011ce979
See the new T18151x test case.
</pre>
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<h4>5 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="#04359c28c9e4de11d44a0c6ab10e9245d68ee640">
docs/users_guide/bugs.rst
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<li class="file-stats">
<a href="#cc621eaf1b1d8b5e9f0567ebb18da41ddda7c9f1">
<span class="new-file">
+
testsuite/tests/deSugar/should_run/T18151x.hs
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<li class="file-stats">
<a href="#05319e7caf6cefd4284443d14a8d3d1fb76b42ea">
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testsuite/tests/deSugar/should_run/T18151x.stdout
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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/716385c90f2f89ac45e256cdb7cdada1981b31ad...bf2411a3c198cb2df93a9e0aa0c3b8297f47058d#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="70" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -70,6 +70,8 @@ import GHC.Utils.Panic</td>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.PatSyn</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.LanguageExtensions</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">LangExt</span></span>
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<td class="diff-line-num new new_line" data-linenumber="74" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC76" 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="LC77" 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="347" 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="349" 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">@@ -347,7 +349,11 @@ converting to core it must become a CO.</td>
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Desugaring operator sections]</span></span>
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<pre style="margin: 0;"> <span id="LC351" 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="LC350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">At first it looks as if we can convert</span></span>
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Desugaring left sections with -XPostfixOperators is straightforward: convert</span></span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(expr `op`) to (op expr).</span></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Without -XPostfixOperators it's a bit more tricky. At first it looks as if we</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">can convert</span></span>
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (expr `op`)</span></span>
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<pre style="margin: 0;"> <span id="LC359" 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">@@ -398,6 +404,13 @@ dsExpr e@(OpApp _ e1 op e2)</td>
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<pre style="margin: 0;"> <span id="LC404" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Desugaring operator sections].</span></span>
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<pre style="margin: 0;"> <span id="LC405" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- N.B. this also must handle postfix operator sections due to -XPostfixOperators.</span></span>
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<pre style="margin: 0;"> <span id="LC406" class="line" lang="haskell"><span class="n" style="color: #333;">dsExpr</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SectionL</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">op</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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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"> <span class="n" style="color: #333;">postfix_operators</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">PostfixOperators</span></span>
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<pre style="margin: 0;">+<span id="LC408" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">postfix_operators</span> <span class="kr" style="font-weight: 600;">then</span></span>
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Desugar (e !) to ((!) e)</span></span>
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">op'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dsWhenNoErrs</span> <span class="p">(</span><span class="n" style="color: #333;">dsLExprNoLP</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">expr'</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC412" class="line" lang="haskell"> <span class="n" style="color: #333;">mkCoreAppDs</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"sectionl"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="n" style="color: #333;">op'</span> <span class="n" style="color: #333;">expr'</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"> <span class="n" style="color: #333;">core_op</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">op</span></span>
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402
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<pre style="margin: 0;"> <span id="LC415" class="line" lang="haskell"> <span class="n" style="color: #333;">x_core</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">splitFunTys</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">core_op</span><span class="p">)</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">@@ -438,31 +438,6 @@ The Foreign Function Interface</td>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="plaintext"> single: hs_init</span>
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<pre style="margin: 0;"> <span id="LC439" class="line" lang="plaintext"> single: hs_exit</span>
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<pre style="margin: 0;"> <span id="LC440" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC441" class="line" lang="plaintext">.. _infelicities-operator-sections:</span>
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<pre style="margin: 0;">-<span id="LC442" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC443" class="line" lang="plaintext">Operator sections</span>
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<pre style="margin: 0;">-<span id="LC444" class="line" lang="plaintext">^^^^^^^^^^^^^^^^^</span>
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<pre style="margin: 0;">-<span id="LC445" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC446" class="line" lang="plaintext">The Haskell Report demands that, for infix operators ``%``, the following</span>
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<pre style="margin: 0;">-<span id="LC447" class="line" lang="plaintext">identities hold:</span>
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<pre style="margin: 0;">-<span id="LC448" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC449" class="line" lang="plaintext">::</span>
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<pre style="margin: 0;">-<span id="LC450" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC451" class="line" lang="plaintext"> (% expr) = \x -> x % expr</span>
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<pre style="margin: 0;">-<span id="LC452" class="line" lang="plaintext"> (expr %) = \x -> expr % x</span>
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<pre style="margin: 0;">-<span id="LC454" class="line" lang="plaintext">However, the second law is violated in the presence of undefined operators,</span>
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<pre style="margin: 0;">-<span id="LC455" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC456" class="line" lang="plaintext">::</span>
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<pre style="margin: 0;">-<span id="LC457" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC458" class="line" lang="plaintext"> (%) = error "urk"</span>
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<pre style="margin: 0;">-<span id="LC459" class="line" lang="plaintext"> (() %) `seq` () -- urk</span>
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<pre style="margin: 0;">-<span id="LC460" class="line" lang="plaintext"> (\x -> () % x) `seq` () -- OK, result ()</span>
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<pre style="margin: 0;">-<span id="LC461" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC462" class="line" lang="plaintext">The operator section is treated like function application of an undefined</span>
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<pre style="margin: 0;">-<span id="LC463" class="line" lang="plaintext">function, while the lambda form is in WHNF that contains an application of an</span>
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<pre style="margin: 0;">-<span id="LC464" class="line" lang="plaintext">undefined function.</span>
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<pre style="margin: 0;">-<span id="LC465" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC441" class="line" lang="plaintext">.. _haskell-98-2010-undefined:</span>
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC443" class="line" lang="plaintext">GHC's interpretation of undefined behaviour in Haskell 98 and Haskell 2010</span>
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<li id="cc621eaf1b1d8b5e9f0567ebb18da41ddda7c9f1">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/716385c90f2f89ac45e256cdb7cdada1981b31ad...bf2411a3c198cb2df93a9e0aa0c3b8297f47058d#cc621eaf1b1d8b5e9f0567ebb18da41ddda7c9f1"><strong>testsuite/tests/deSugar/should_run/T18151x.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 PostfixOperators #-}</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;">Control.Exception</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">MyException</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MyE</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Show</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Exception</span> <span class="kt" style="color: #458; font-weight: 600;">MyException</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="p">(</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="p">(</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">throw</span> <span class="kt" style="color: #458; font-weight: 600;">MyE</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" 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="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">try</span> <span class="p">(</span><span class="n" style="color: #333;">evaluate</span> <span class="p">(</span><span class="n" style="color: #333;">seq</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">r</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="kt" style="color: #458; font-weight: 600;">MyE</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">putStrLn</span> <span class="s" style="color: #d14;">"PostfixOperators ok"</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">putStrLn</span> <span class="s" style="color: #d14;">"PostfixOperators broken"</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/716385c90f2f89ac45e256cdb7cdada1981b31ad...bf2411a3c198cb2df93a9e0aa0c3b8297f47058d#05319e7caf6cefd4284443d14a8d3d1fb76b42ea"><strong>testsuite/tests/deSugar/should_run/T18151x.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">PostfixOperators ok</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/716385c90f2f89ac45e256cdb7cdada1981b31ad...bf2411a3c198cb2df93a9e0aa0c3b8297f47058d#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">@@ -65,6 +65,7 @@ test('T11747', normal, compile_and_run, ['-dcore-lint'])</td>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12595</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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<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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<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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<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;">T18151x</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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<pre style="margin: 0;"> <span id="LC69" 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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69
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70
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="perl"></span>
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70
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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;">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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