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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>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ab4d15898c03a5db6741feb2028488facf032fa4">ab4d1589</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-08-11T22:18:03-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">typecheck: Drop SPECIALISE pragmas when there is no unfolding
Previously the desugarer would instead fall over when it realized that
there was no unfolding for an imported function with a SPECIALISE
pragma. We now rather drop the SPECIALISE pragma and throw a warning.
Fixes #18118.
</pre>
</li>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0ac8c0a551619b52e0f151d6781b11dd66cf2110">0ac8c0a5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-11T22:18:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #18118
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<h4>4 changed files:</h4>
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<a href="#eade747fa0a15693c67617629e286714fce958e4">
compiler/GHC/Tc/Gen/Sig.hs
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<a href="#6cb371fe5037165bb9a03d01752e28097f259f02">
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testsuite/tests/typecheck/should_compile/T18118.hs
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testsuite/tests/typecheck/should_compile/T18118A.hs
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<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="eade747fa0a15693c67617629e286714fce958e4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/acf537f9fefa31883b7cb28ff61b837ab7f8a44a...0ac8c0a551619b52e0f151d6781b11dd66cf2110#eade747fa0a15693c67617629e286714fce958e4"><strong>compiler/GHC/Tc/Gen/Sig.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">@@ -826,9 +826,13 @@ tcImpPrags prags</td>
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"><span class="n" style="color: #333;">tcImpSpec</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Sig</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcSpecPrag</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"><span class="n" style="color: #333;">tcImpSpec</span> <span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">prag</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC828" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLookupId</span> <span class="n" style="color: #333;">name</span></span>
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<pre style="margin: 0;">-<span id="LC829" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">isAnyInlinePragma</span> <span class="p">(</span><span class="n" style="color: #333;">idInlinePragma</span> <span class="n" style="color: #333;">id</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC830" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">addWarnTc</span> <span class="kt" style="color: #458; font-weight: 600;">NoReason</span> <span class="p">(</span><span class="n" style="color: #333;">impSpecErr</span> <span class="n" style="color: #333;">name</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC831" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcSpecPrag</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">prag</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isAnyInlinePragma</span> <span class="p">(</span><span class="n" style="color: #333;">idInlinePragma</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">tcSpecPrag</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">prag</span></span>
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<pre style="margin: 0;">+<span id="LC831" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">addWarnTc</span> <span class="kt" style="color: #458; font-weight: 600;">NoReason</span> <span class="p">(</span><span class="n" style="color: #333;">impSpecErr</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If there is no INLINE/INLINABLE pragma there will be no unfolding. In</span></span>
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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that case, just delete the SPECIALISE pragma altogether, lest the</span></span>
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- desugarer fall over because it can't find the unfolding. See #18118.</span></span>
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC837" class="line" lang="haskell"><span class="n" style="color: #333;">impSpecErr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"><span class="n" style="color: #333;">impSpecErr</span> <span class="n" style="color: #333;">name</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/acf537f9fefa31883b7cb28ff61b837ab7f8a44a...0ac8c0a551619b52e0f151d6781b11dd66cf2110#6cb371fe5037165bb9a03d01752e28097f259f02"><strong>testsuite/tests/typecheck/should_compile/T18118.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18118</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">myfun</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</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;">T18118A</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="cp" style="color: #999; font-weight: 600;">{-# SPECIALISE myfun :: Double #-}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/acf537f9fefa31883b7cb28ff61b837ab7f8a44a...0ac8c0a551619b52e0f151d6781b11dd66cf2110#affaa54d15b68aea1ebdae90351a9a5ba9b1dea3"><strong>testsuite/tests/typecheck/should_compile/T18118A.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18118A</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="n" style="color: #333;">myfun</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="n" style="color: #333;">myfun</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/acf537f9fefa31883b7cb28ff61b837ab7f8a44a...0ac8c0a551619b52e0f151d6781b11dd66cf2110#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="717" 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">@@ -717,5 +717,6 @@ test('T17775-viewpats-a', normal, compile, [''])</td>
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717
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717
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<pre style="margin: 0;"> <span id="LC717" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17775-viewpats-b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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718
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718
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<pre style="margin: 0;"> <span id="LC718" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17775-viewpats-c</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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719
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719
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<pre style="margin: 0;"> <span id="LC719" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17775-viewpats-d</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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720
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18118</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">multimod_compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T18118</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">-v0</span><span class="p">'])</span></span>
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720
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721
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<pre style="margin: 0;"> <span id="LC721" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18412</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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721
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722
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<pre style="margin: 0;"> <span id="LC722" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18470</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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