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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 - invalid error: reference to local variable 'xxx' declared in enclosing lambda"
href="https://bugs.llvm.org/show_bug.cgi?id=41165">41165</a>
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<th>Summary</th>
<td>invalid error: reference to local variable 'xxx' declared in enclosing lambda
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>7.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++'17
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>jonathan.poelen@gmail.com
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>template<class... Ts>
void foo(Ts... xs)
{
[&](auto&... lhs){
[&](auto&... rhs){
((lhs = rhs), ...);
}(xs...);
}(xs...);
}
int main()
{
foo(1);
}
test.cpp:6:15: error: reference to local variable 'lhs' declared in enclosing
lambda expression
((lhs = rhs), ...);
^
If lhs is captured explicitly, there is no error, but a warning:
test.cpp:5:11: warning: lambda capture 'lhs' is not used
[-Wunused-lambda-capture]
[&lhs...](auto&... rhs){
^
(Works with GCC and MSVC)</pre>
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