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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [coroutine] undefined behavior when nested lambda coroutine captures automatic variables by reference"
href="https://bugs.llvm.org/show_bug.cgi?id=52136">52136</a>
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<th>Summary</th>
<td>[coroutine] undefined behavior when nested lambda coroutine captures automatic variables by reference
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>12.0
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++2a
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>bhalevy@gmail.com
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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
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<pre>Reproducer: <a href="https://godbolt.org/z/3d37ME161">https://godbolt.org/z/3d37ME161</a>
Since clang 12.0.0 through to current trunk.
Coroutine foo instantiates a coroutine lambda.
When references to automatic variable are passed to the lambda coroutine as
arguments, all is well.
However, when the lambda captures the local variables by reference they seem to
go out of scope and referring to them in the lambda results in undefined
behavior.</pre>
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