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<h3>
Ben Gamari pushed to branch cherry-pick-e172a6d1
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/334dd6da47326f47ba3425376728feda6245c7c1">334dd6da</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-05-08T13:31:22Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #16603 by documenting some important changes in changelogs
This addresses some glaring omissions from
`libraries/base/changelog.md` and
`docs/users_guide/8.8.1-notes.rst`, fixing #16603 in the process.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/605869c7b776ce6071a31ff447998b081e0354ed">605869c7</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-06-03T21:28:12Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix optSemi type in Parser.y
The definition of 'optSemi' claimed it had type
([Located a],Bool)
Note that its production actually returns ([Located Token],Bool):
: ';' { ([$1],True) } -- $1 :: Located Token
Due to an infelicity in the implementation of 'happy -c', it effectively
resulted in 'unsafeCoerce :: Token -> a'.
See https://github.com/simonmar/happy/pull/134
If any consumer of 'optSemi' tried to instantiate 'a' to something not
representationally equal to 'Token', they would experience a segfault.
In addition to that, this definition made it impossible to compile Parser.y
without the -c flag (as it's reliant on this bug to cast 'Token' to 'forall
a. a').
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/07131494e77f4c985c2cef369238dc8e83a98a90">07131494</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-06-04T03:41:36Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable external interpreter when TH is requested but no internal interpreter is available
(cherry picked from commit e172a6d127a65b945b31306ff7b6c43320debfb4)</pre>
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<h4>4 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#72690aad4036dea6e6e116c30e4d7582f5077db7">
compiler/main/DriverPipeline.hs
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<li class="file-stats">
<a href="#a9d23eb447426d7f3469127262985af461dfad78">
compiler/parser/Parser.y
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<li class="file-stats">
<a href="#8d11c404e91070407324f71df4a47224c0887148">
docs/users_guide/8.8.1-notes.rst
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<li class="file-stats">
<a href="#392e9dfd3417e267d708c5ab16536f2994d43745">
libraries/base/changelog.md
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<h4>Changes:</h4>
<li id="72690aad4036dea6e6e116c30e4d7582f5077db7">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/0cf2cdbb5b5bd751b0f9c9a8fce4b432688c6db5...07131494e77f4c985c2cef369238dc8e83a98a90#72690aad4036dea6e6e116c30e4d7582f5077db7"><strong>compiler/main/DriverPipeline.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="258" 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">@@ -258,16 +258,23 @@ compileOne' m_tc_result mHscMessage</td>
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<pre style="margin: 0;"> <span id="LC258" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">gopt_set</span> <span class="n" style="color: #333;">dflags0</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_BuildDynamicToo</span></span>
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<pre style="margin: 0;"> <span id="LC259" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">dflags0</span></span>
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<pre style="margin: 0;"> <span id="LC260" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- #16331 - when no "internal interpreter" is available but we</span></span>
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<td class="diff-line-num new new_line" data-linenumber="262" 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="LC262" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- need to process some TemplateHaskell or QuasiQuotes, we automatically</span></span>
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<td class="diff-line-num new new_line" data-linenumber="263" 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="LC263" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- turn on -fexternal-interpreter.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="264" 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="LC264" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">internalInterpreter</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">needsLinker</span></span>
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<td class="diff-line-num new new_line" data-linenumber="265" 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="LC265" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">gopt_set</span> <span class="n" style="color: #333;">dflags1</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_ExternalInterpreter</span></span>
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<td class="diff-line-num new new_line" data-linenumber="266" 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="LC266" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">dflags1</span></span>
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"> <span class="n" style="color: #333;">basename</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dropExtension</span> <span class="n" style="color: #333;">input_fn</span></span>
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We add the directory in which the .hs files resides) to the import</span></span>
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<pre style="margin: 0;"> <span id="LC271" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- path. This is needed when we try to compile the .hc file later, if it</span></span>
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<pre style="margin: 0;"> <span id="LC272" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- imports a _stub.h file that we created here.</span></span>
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<pre style="margin: 0;"> <span id="LC273" class="line" lang="haskell"> <span class="n" style="color: #333;">current_dir</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">takeDirectory</span> <span class="n" style="color: #333;">basename</span></span>
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<pre style="margin: 0;">-<span id="LC267" class="line" lang="haskell"> <span class="n" style="color: #333;">old_paths</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">includePaths</span> <span class="n" style="color: #333;">dflags<span class="idiff left right">1</span></span></span>
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="haskell"> <span class="n" style="color: #333;">old_paths</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">includePaths</span> <span class="n" style="color: #333;">dflags<span class="idiff left right">2</span></span></span>
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">prevailing_dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hsc_dflags</span> <span class="n" style="color: #333;">hsc_env0</span></span>
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<pre style="margin: 0;"> <span id="LC276" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC270" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags<span class="idiff left right">1</span></span> <span class="p">{</span> <span class="n" style="color: #333;">includePaths</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addQuoteInclude</span> <span class="n" style="color: #333;">old_paths</span> <span class="p">[</span><span class="n" style="color: #333;">current_dir</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags<span class="idiff left right">2</span></span> <span class="p">{</span> <span class="n" style="color: #333;">includePaths</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addQuoteInclude</span> <span class="n" style="color: #333;">old_paths</span> <span class="p">[</span><span class="n" style="color: #333;">current_dir</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">log_action</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log_action</span> <span class="n" style="color: #333;">prevailing_dflags</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC279" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- use the prevailing log_action / log_finaliser,</span></span>
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<pre style="margin: 0;"> <span id="LC280" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- not the one cached in the summary. This is so</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/0cf2cdbb5b5bd751b0f9c9a8fce4b432688c6db5...07131494e77f4c985c2cef369238dc8e83a98a90#a9d23eb447426d7f3469127262985af461dfad78"><strong>compiler/parser/Parser.y</strong></a>
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- -*-haskell-*-</span></span>
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3
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ---------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (c) The University of Glasgow 1997-2003</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2586" 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">@@ -2586,7 +2585,7 @@ exp10 :: { LHsExpr GhcPs }</td>
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2586
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<pre style="margin: 0;"> <span id="LC2585" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">scc_annot</span> <span class="n" style="color: #333;">exp</span> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">ams</span> <span class="p">(</span><span class="n" style="color: #333;">sLL</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$></span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsSCC</span> <span class="n" style="color: #333;">noExt</span> <span class="p">(</span><span class="n" style="color: #333;">snd</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">snd</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2586" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2587" class="line" lang="haskell"></span>
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2589
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<pre style="margin: 0;">-<span id="LC2589" class="line" lang="haskell"><span class="n" style="color: #333;">optSemi</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;"><span class="idiff left right">a</span></span><span class="p">],</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2588" class="line" lang="haskell"><span class="n" style="color: #333;">optSemi</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Token</span></span><span class="p">],</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2589" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="sc" style="color: #d14;">';'</span> <span class="p">{</span> <span class="p">([</span><span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">],</span><span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2590" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="cm" style="color: #998; font-style: italic;">{- empty -}</span> <span class="p">{</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2591" 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">@@ -23,6 +23,21 @@ Full details</td>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext">Language</span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext">~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext">- GHC now supports visible kind applications, as described in</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"> `GHC proposal #15 <https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0015-type-level-type-applications.rst>`__. This extends the existing</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> :ref:`visible type applications <visible-type-application>` feature to permit</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext"> type applications at the type level (e.g., ``f :: Proxy ('Just @Bool 'True)``) in</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"> addition to the term level (e.g., ``g = Just @Bool True``).</span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext">- GHC now allows explicitly binding type variables in type family instances and</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"> rewrite rules, as described in</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext"> `GHC proposal #7 <https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0007-instance-foralls.rst>`__. For instance: ::</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext"> type family G a b where</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext"> forall x y. G [x] (Proxy y) = Double</span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="plaintext"> forall z. G z z = Bool</span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext"> {-# RULES "example" forall a. forall (x :: a). id x = x #-}</span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext">- :extension:`ScopedTypeVariables`: The type variable that a type signature on</span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext"> a pattern can bring into scope can now stand for arbitrary types. Previously,</span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext"> they could only stand in for other type variables, but this restriction was deemed</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">@@ -76,6 +91,13 @@ Language</td>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="plaintext">Compiler</span>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="plaintext">~~~~~~~~</span>
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93
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext"></span>
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94
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="plaintext">- The final phase of the ``MonadFail`` proposal has been implemented.</span>
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95
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="plaintext"> Accordingly, the ``MonadFailDesugaring`` language extension is now</span>
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96
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="plaintext"> deprecated, as its effects are always enabled. Similarly, the</span>
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97
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="plaintext"> ``-Wnoncanonical-monadfail-instances`` flag is also deprecated, as there is</span>
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98
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="plaintext"> no longer any way to define a "non-canonical" ``Monad`` or ``MonadFail``</span>
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99
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="plaintext"> instance.</span>
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100
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="plaintext"></span>
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79
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101
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="plaintext">- New :ghc-flag:`-keep-hscpp-files` to keep the output of the CPP pre-processor.</span>
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80
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102
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="plaintext"></span>
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81
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103
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="plaintext">- The :ghc-flag:`-Wcompat` warning group now includes :ghc-flag:`-Wstar-is-type`.</span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="156" 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">@@ -134,6 +156,13 @@ Template Haskell</td>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="plaintext"> longer included when reifying ``C``. It's possible that this may break some</span>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="plaintext"> code which assumes the existence of ``forall a. C a =>``.</span>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="plaintext">- Template Haskell has been updated to support visible kind applications and</span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="plaintext"> explicit ``foralls`` in type family instances and ``RULES``. These required</span>
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="plaintext"> a couple of backwards-incompatible changes to the ``template-haskell`` API.</span>
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="plaintext"> Please refer to the</span>
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="plaintext"> `GHC 8.8 Migration Guide <https://gitlab.haskell.org/ghc/ghc/wikis/migration/8.8#template-haskell-21500>`__</span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="plaintext"> for more details.</span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="plaintext"></span>
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137
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166
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="plaintext">- Template Haskell now supports implicit parameters and recursive do.</span>
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138
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="plaintext"></span>
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168
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="plaintext">- Template Haskell splices can now embed assembler source (:ghc-ticket:`16180`)</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="156" 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="185" 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">@@ -156,6 +185,20 @@ Template Haskell</td>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="plaintext">``base`` library</span>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="plaintext">~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="plaintext">- The final phase of the ``MonadFail`` proposal has been implemented. As a</span>
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="plaintext"> result of this change:</span>
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="plaintext"> - The ``fail`` method of ``Monad`` has been removed in favor of the method of</span>
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="plaintext"> the same name in the ``MonadFail`` class.</span>
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="plaintext"> - ``MonadFail(fail)`` is now re-exported from the ``Prelude`` and</span>
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="plaintext"> ``Control.Monad`` modules.</span>
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="plaintext"> These are breaking changes that may require you to update your code. Please</span>
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="plaintext"> refer to the</span>
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="plaintext"> `GHC 8.8 Migration Guide <https://gitlab.haskell.org/ghc/ghc/wikis/migration/8.8#base-41300>`__</span>
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="plaintext"> for more details.</span>
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="plaintext">- Support the characters from recent versions of Unicode (up to v. 12) in literals</span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="plaintext"> (see :ghc-ticket:`5518`).</span>
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/0cf2cdbb5b5bd751b0f9c9a8fce4b432688c6db5...07131494e77f4c985c2cef369238dc8e83a98a90#392e9dfd3417e267d708c5ab16536f2994d43745"><strong>libraries/base/changelog.md</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">@@ -3,6 +3,14 @@</td>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## 4.13.0.0 *TBA*</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="markdown"><span class="p"> *</span> Bundled with GHC <span class="ge" style="font-style: italic;">*TBA*</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="markdown"><span class="p"> *</span> The final phase of the <span class="sb" style="color: #d14;">`MonadFail`</span> proposal has been implemented:</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="markdown"><span class="sb" style="color: #d14;"> * The `fail` method of `Monad` has been removed in favor of the method of</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="markdown"><span class="sb" style="color: #d14;"> the same name in the `MonadFail` class.</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="markdown"><span class="sb" style="color: #d14;"> * `MonadFail(fail)` is now re-exported from the `Prelude` and</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="markdown"><span class="sb" style="color: #d14;"> `Control.Monad` modules.</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="markdown"><span class="p"> *</span> Fix <span class="sb" style="color: #d14;">`Show`</span> instance of <span class="sb" style="color: #d14;">`Data.Fixed`</span>: Negative numbers are now parenthesized</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="markdown"> according to their surrounding context. I.e. <span class="sb" style="color: #d14;">`Data.Fixed.show`</span> produces</span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="markdown"> syntactically correct Haskell for expressions like <span class="sb" style="color: #d14;">`Just (-1 :: Fixed E2)`</span>.</span>
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