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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Integral promotion on incomplete enum types"
href="https://bugs.llvm.org/show_bug.cgi?id=50578">50578</a>
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<th>Summary</th>
<td>Integral promotion on incomplete enum types
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>rs2740@gmail.com
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>int f(int);
template<class E>
E&& g();
enum E {
e = decltype(f(g<E>()))(42),
};
This is rejected by clang 9 and accepted since 10.
Initialization of the parameter of f involves an lvalue-to-rvalue conversion on
g<E>() followed by an integral promotion. The former should be ill-formed by
[conv.lval]p1:
A glvalue of a non-function, non-array type T can be converted to a prvalue. If
T is an incomplete type, a program that necessitates this conversion is
ill-formed.</pre>
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