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<h3>

Vladislav Zavialov pushed to branch wip/postfix-operators

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/2ca1f851fff953d433282ece7146f2fb4f638e59">2ca1f851</a></strong>

<div>

<span>by Vladislav Zavialov</span>

<i>at 2020-10-13T20:37:30+03:00</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/db665fd671c23fb79b35f4a902d792dbb32f3531">db665fd6</a></strong>

<div>

<span>by Vladislav Zavialov</span>

<i>at 2020-10-13T20:37:30+03:00</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

</a>

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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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<a href="#05319e7caf6cefd4284443d14a8d3d1fb76b42ea">

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+

testsuite/tests/deSugar/should_run/T18151x.stdout

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<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/ac67a2a6dc56e95fdb93448e1f4c05873ebc65fd...db665fd671c23fb79b35f4a902d792dbb32f3531#6bdd5abc649727f2a802bc96ce5c276de19d3726"><strong>compiler/GHC/HsToCore/Expr.hs</strong></a>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -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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<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 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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<td class="diff-line-num new_line old" data-linenumber="352" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="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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<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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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ac67a2a6dc56e95fdb93448e1f4c05873ebc65fd...db665fd671c23fb79b35f4a902d792dbb32f3531#04359c28c9e4de11d44a0c6ab10e9245d68ee640"><strong>docs/users_guide/bugs.rst</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">@@ -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>

</pre>

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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>

</pre>

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<pre style="margin: 0;">-<span id="LC443" class="line" lang="plaintext">Operator sections</span>

</pre>

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<pre style="margin: 0;">-<span id="LC444" class="line" lang="plaintext">^^^^^^^^^^^^^^^^^</span>

</pre>

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<pre style="margin: 0;">-<span id="LC445" class="line" lang="plaintext"></span>

</pre>

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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>

</pre>

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<pre style="margin: 0;">-<span id="LC447" class="line" lang="plaintext">identities hold:</span>

</pre>

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<pre style="margin: 0;">-<span id="LC448" class="line" lang="plaintext"></span>

</pre>

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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>

</pre>

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<pre style="margin: 0;">-<span id="LC451" class="line" lang="plaintext">    (% expr) = \x -> x % expr</span>

</pre>

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<pre style="margin: 0;">-<span id="LC452" class="line" lang="plaintext">    (expr %) = \x -> expr % x</span>

</pre>

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<pre style="margin: 0;">-<span id="LC453" class="line" lang="plaintext"></span>

</pre>

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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>

</pre>

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<pre style="margin: 0;">-<span id="LC455" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC456" class="line" lang="plaintext">::</span>

</pre>

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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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="459" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

459

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<pre style="margin: 0;">-<span id="LC459" class="line" lang="plaintext">    (() %)         `seq` () -- urk</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="460" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

460

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<pre style="margin: 0;">-<span id="LC460" class="line" lang="plaintext">    (\x -> () % x) `seq` () -- OK, result ()</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="461" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

461

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<pre style="margin: 0;">-<span id="LC461" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="462" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

462

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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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="463" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

463

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<td class="diff-line-num new_line old" data-linenumber="441" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC463" class="line" lang="plaintext">function, while the lambda form is in WHNF that contains an application of an</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="464" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

464

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<pre style="margin: 0;">-<span id="LC464" class="line" lang="plaintext">undefined function.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="465" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

465

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<pre style="margin: 0;">-<span id="LC465" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="466" 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">

466

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441

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<pre style="margin: 0;"> <span id="LC441" class="line" lang="plaintext">.. _haskell-98-2010-undefined:</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="467" 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">

467

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<td class="diff-line-num new_line" data-linenumber="442" 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">

442

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<pre style="margin: 0;"> <span id="LC442" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="468" 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">

468

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<td class="diff-line-num new_line" data-linenumber="443" 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">

443

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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>

</pre>

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<br>

</li>

<li id="cc621eaf1b1d8b5e9f0567ebb18da41ddda7c9f1">

<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ac67a2a6dc56e95fdb93448e1f4c05873ebc65fd...db665fd671c23fb79b35f4a902d792dbb32f3531#cc621eaf1b1d8b5e9f0567ebb18da41ddda7c9f1"><strong>testsuite/tests/deSugar/should_run/T18151x.hs</strong></a>

<hr>

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1

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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>

</pre>

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2

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="0" 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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3

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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>

</pre>

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4

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>

</pre>

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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;">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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="6" 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">

6

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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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="0" 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="7" 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">

7

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="8" 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">

8

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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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="9" 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">

9

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>

</pre>

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10

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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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11

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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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12

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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>

</pre>

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13

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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>

</pre>

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14

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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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="15" 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">

15

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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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="16" 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">

16

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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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="17" 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">

17

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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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<li id="05319e7caf6cefd4284443d14a8d3d1fb76b42ea">

<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ac67a2a6dc56e95fdb93448e1f4c05873ebc65fd...db665fd671c23fb79b35f4a902d792dbb32f3531#05319e7caf6cefd4284443d14a8d3d1fb76b42ea"><strong>testsuite/tests/deSugar/should_run/T18151x.stdout</strong></a>

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1

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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">PostfixOperators ok</span></pre>

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<li id="dd8561f0b2e04faceab592f6504b9c483c57484a">

<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ac67a2a6dc56e95fdb93448e1f4c05873ebc65fd...db665fd671c23fb79b35f4a902d792dbb32f3531#dd8561f0b2e04faceab592f6504b9c483c57484a"><strong>testsuite/tests/deSugar/should_run/all.T</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="65" 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">@@ -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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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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<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>

</pre>

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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>

</pre>

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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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="69" 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">

69

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<td class="diff-line-num 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">

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<pre style="margin: 0;"> <span id="LC70" class="line" lang="perl"></span>

</pre>

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<td class="diff-line-num old_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">

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<td class="diff-line-num new_line" data-linenumber="71" 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="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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