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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Accepts-invalid with parameter pack expansion in lambda capture"
href="https://bugs.llvm.org/show_bug.cgi?id=47852">47852</a>
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</tr>
<tr>
<th>Summary</th>
<td>Accepts-invalid with parameter pack expansion in lambda capture
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++17
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sgiesecke@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Referring to this gcc bug report
(<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97358#c2">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97358#c2</a>), clang accepts this
seemingly invalid code:
```
template <typename... T> void foo (T... x)
{
}
template <typename... T> void bar (T... x)
{
foo ([x...] { static_cast<void> (x); }...);
}
void
test ()
{
bar ();
bar (1);
bar (2.0, 3LL, 4);
}
```
gcc trunk produces these errors now:
```
<source>: In lambda function:
<source>:7:17: error: parameter packs not expanded with '...':
7 | foo ([x...] { static_cast<void> (x); }...);
| ^~~~~~~~~~~~~~~~~~~~~
<source>:7:17: note: 'x'
<source>: In function 'void bar(T ...)':
<source>:7:41: error: expansion pattern '<lambda>' contains no parameter packs
7 | foo ([x...] { static_cast<void> (x); }...);
| ^~~
ASM generation compiler returned: 1
<source>: In lambda function:
<source>:7:17: error: parameter packs not expanded with '...':
7 | foo ([x...] { static_cast<void> (x); }...);
| ^~~~~~~~~~~~~~~~~~~~~
<source>:7:17: note: 'x'
<source>: In function 'void bar(T ...)':
<source>:7:41: error: expansion pattern '<lambda>' contains no parameter packs
7 | foo ([x...] { static_cast<void> (x); }...);
| ^~~
Execution build compiler returned: 1
```
Earlier gcc versions produced an ICE, which the mentioned bug was about.</pre>
</div>
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