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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 active union member change"
href="https://bugs.llvm.org/show_bug.cgi?id=43762">43762</a>
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<th>Summary</th>
<td>Invalid active union member change
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>n@ndor.email
</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>The following should not compile:
class A {
public:
int x = 1;
constexpr virtual int f() = 0;
};
class B : public A {
public:
int y = 1;
constexpr virtual int f() override { return 1; }
};
union U {
int n;
B b;
};
constexpr int test() {
U u { .n = 5 };
u.b.x = 10;
return u.b.f();
}
static_assert(test());</pre>
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