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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Implement CWG 2096"
href="https://bugs.llvm.org/show_bug.cgi?id=40837">40837</a>
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<th>Summary</th>
<td>Implement CWG 2096
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++'17
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>Casey@Carter.net
</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>Compiling this well-formed TU:
struct nonliteral {
nonliteral() {}
};
union U {
int head_;
nonliteral tail_;
constexpr U() : head_{} {}
};
constexpr U u{};
with "clang++ -std=c++17" diagnoses (<a href="https://godbolt.org/z/lQKtv8">https://godbolt.org/z/lQKtv8</a>):
source>:12:17: error: constexpr variable cannot have non-literal type
'const U'
constexpr U u{};
^
<source>:7:20: note: 'U' is not literal because it has data member 'tail_'
of non-literal type 'nonliteral'
nonliteral tail_;
^
1 error generated.
This impacts usage of std::variant with a mix of literal and non-literal types
in a constant expression.</pre>
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