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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/30a63e79c65b023497af4fe2347149382c71829d">30a63e79</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-02T01:50:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix two ASSERT buglets in reifyDataCon
Two `ASSERT`s in `reifyDataCon` were always using `arg_tys`, but
`arg_tys` is not meaningful for GADT constructors. In fact, it's
worse than non-meaningful, since using `arg_tys` when reifying a
GADT constructor can lead to failed `ASSERT`ions, as #17305
demonstrates.
This patch applies the simplest possible fix to the immediate
problem. The `ASSERT`s now use `r_arg_tys` instead of `arg_tys`, as
the former makes sure to give something meaningful for GADT
constructors. This makes the panic go away at the very least. There
is still an underlying issue with the way the internals of
`reifyDataCon` work, as described in
https://gitlab.haskell.org/ghc/ghc/issues/17305#note_227023, but we
leave that as future work, since fixing the underlying issue is
much trickier (see
https://gitlab.haskell.org/ghc/ghc/issues/17305#note_227087).
</pre>
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<h4>4 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#4f8d5e20ad75b577322cf46f2e146466d905fe43">
compiler/typecheck/TcSplice.hs
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<li class="file-stats">
<a href="#04b9f675e37d99fa44409acbc392b8bf28ea2ec0">
<span class="new-file">
+
testsuite/tests/th/T17305.hs
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<li class="file-stats">
<a href="#fa631abd913250a1b4df535616fda34fc1a6f300">
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+
testsuite/tests/th/T17305.stderr
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<li class="file-stats">
<a href="#6f885f60b8c0fea6b94dd73a67d02212eedb4498">
testsuite/tests/th/all.T
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<h4>Changes:</h4>
<li id="4f8d5e20ad75b577322cf46f2e146466d905fe43">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30a63e79c65b023497af4fe2347149382c71829d#4f8d5e20ad75b577322cf46f2e146466d905fe43"><strong>compiler/typecheck/TcSplice.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1769" 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">@@ -1769,7 +1769,7 @@ reifyDataCon isGadtDataCon tys dc</td>
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1769
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1769
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<pre style="margin: 0;"> <span id="LC1769" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constructors can be declared infix.</span></span>
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<td class="diff-line-num old_line" data-linenumber="1770" 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">
1770
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<td class="diff-line-num new_line" data-linenumber="1770" 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">
1770
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<pre style="margin: 0;"> <span id="LC1770" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Infix GADT constructors] in TcTyClsDecls.</span></span>
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1771
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1771
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<pre style="margin: 0;"> <span id="LC1771" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">dataConIsInfix</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">isGadtDataCon</span> <span class="o" style="font-weight: 600;">-></span></span>
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1772
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<pre style="margin: 0;">-<span id="LC1772" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">arg_tys</span> <span class="p">`</span><span class="n" style="color: #333;">lengthIs</span><span class="p">`</span> <span class="mi" style="color: #099;">2</span> <span class="p">)</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC1772" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;"><span class="idiff left right">r_</span>arg_tys</span> <span class="p">`</span><span class="n" style="color: #333;">lengthIs</span><span class="p">`</span> <span class="mi" style="color: #099;">2</span> <span class="p">)</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1773
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1773
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<pre style="margin: 0;"> <span id="LC1773" class="line" lang="haskell"> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">[</span><span class="n" style="color: #333;">r_a1</span><span class="p">,</span> <span class="n" style="color: #333;">r_a2</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">r_arg_tys</span></span>
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1774
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1774
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<pre style="margin: 0;"> <span id="LC1774" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">s1</span><span class="p">,</span> <span class="n" style="color: #333;">s2</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dcdBangs</span></span>
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1775
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1775
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<pre style="margin: 0;"> <span id="LC1775" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">InfixC</span> <span class="p">(</span><span class="n" style="color: #333;">s1</span><span class="p">,</span><span class="n" style="color: #333;">r_a1</span><span class="p">)</span> <span class="n" style="color: #333;">name</span> <span class="p">(</span><span class="n" style="color: #333;">s2</span><span class="p">,</span><span class="n" style="color: #333;">r_a2</span><span class="p">)</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1788" 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="1788" 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">@@ -1788,7 +1788,7 @@ reifyDataCon isGadtDataCon tys dc</td>
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1788
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1788
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<pre style="margin: 0;"> <span id="LC1788" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">cxt</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">reifyCxt</span> <span class="n" style="color: #333;">theta'</span></span>
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<pre style="margin: 0;"> <span id="LC1789" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ex_tvs''</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">reifyTyVars</span> <span class="n" style="color: #333;">ex_tvs'</span></span>
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<pre style="margin: 0;"> <span id="LC1790" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">ForallC</span> <span class="n" style="color: #333;">ex_tvs''</span> <span class="n" style="color: #333;">cxt</span> <span class="n" style="color: #333;">main_con</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1791" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">arg_tys</span> <span class="p">`</span><span class="n" style="color: #333;">equalLength</span><span class="p">`</span> <span class="n" style="color: #333;">dcdBangs</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1791" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;"><span class="idiff left right">r_</span>arg_tys</span> <span class="p">`</span><span class="n" style="color: #333;">equalLength</span><span class="p">`</span> <span class="n" style="color: #333;">dcdBangs</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1792" class="line" lang="haskell"> <span class="n" style="color: #333;">ret_con</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1793" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30a63e79c65b023497af4fe2347149382c71829d#04b9f675e37d99fa44409acbc392b8bf28ea2ec0"><strong>testsuite/tests/th/T17305.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 GADTs #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TemplateHaskell #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T17305</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Language.Haskell.TH</span> <span class="k" style="font-weight: 600;">hiding</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">System.IO</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="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkFoo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">a</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="o" style="font-weight: 600;">$</span><span class="p">(</span><span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">reify</span> <span class="sc" style="color: #d14;">''</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">F</span><span class="n" style="color: #333;">oo</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="n" style="color: #333;">runIO</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hPutStrLn</span> <span class="n" style="color: #333;">stderr</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">pprint</span> <span class="n" style="color: #333;">i</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30a63e79c65b023497af4fe2347149382c71829d#fa631abd913250a1b4df535616fda34fc1a6f300"><strong>testsuite/tests/th/T17305.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">data family T17305.Foo (a_0 :: *) :: *</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">data instance T17305.Foo where</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> T17305.MkFoo :: forall (a_1 :: *) . T17305.Foo a_1</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30a63e79c65b023497af4fe2347149382c71829d#6f885f60b8c0fea6b94dd73a67d02212eedb4498"><strong>testsuite/tests/th/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">@@ -492,6 +492,7 @@ test('T16980a', normal, compile_fail, [''])</td>
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492
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17270a</span><span class="p">',</span> <span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">T17270.hs</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;">T17270</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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493
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493
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<pre style="margin: 0;"> <span id="LC493" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17270b</span><span class="p">',</span> <span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">T17270.hs</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;">T17270</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">-fenable-th-splice-warnings -v0</span><span class="p">'])</span></span>
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494
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494
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<pre style="margin: 0;"> <span id="LC494" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17296</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 class="s1" style="color: #d14;">-v0</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC495" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17305</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 class="s1" style="color: #d14;">-v0</span><span class="p">'])</span></span>
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495
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496
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<pre style="margin: 0;"> <span id="LC496" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17380</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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496
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497
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17394</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 class="s1" style="color: #d14;">-v0 -ddump-splices -dsuppress-uniques</span><span class="p">'])</span></span>
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498
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17379a</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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