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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Variable of dependent non-literal type in constexpr not correctly diagnosed"
href="https://bugs.llvm.org/show_bug.cgi?id=47926">47926</a>
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<th>Summary</th>
<td>Variable of dependent non-literal type in constexpr not correctly diagnosed
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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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>Casey@Carter.net
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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>This TU:
template <class T>
constexpr bool f() {
if (!__builtin_is_constant_evaluated()) {
[[maybe_unused]] T t;
}
return true;
}
struct nonliteral {
~nonliteral() {}
};
static_assert(f<nonliteral>(), "should fail");
is ill-formed per N4868 [dcl.constexpr]/3.5.3 "The definition of a constexpr
function shall satisfy the following requirements:... its function-body shall
not enclose... a definition of a variable of non-literal type ...". Clang fails
to diagnose this TU (<a href="https://godbolt.org/z/xoMGxs">https://godbolt.org/z/xoMGxs</a>).</pre>
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