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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 - constexpr evaluator incorrectly claims double delete with function parameter"
href="https://bugs.llvm.org/show_bug.cgi?id=47805">47805</a>
</td>
</tr>
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<th>Summary</th>
<td>constexpr evaluator incorrectly claims double delete with function parameter
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++2a
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david@doublewise.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
</td>
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<p>
<div>
<pre>The following translation unit
```
struct S {
int * m_ptr;
constexpr S():
m_ptr(new int())
{
}
constexpr S(S && other) noexcept:
m_ptr(other.m_ptr)
{
other.m_ptr = nullptr;
}
constexpr ~S() noexcept {
delete m_ptr;
}
};
constexpr bool test(S v) {
auto x = static_cast<S &&>(v);
return true;
}
static_assert(test(S()));
```
is rejected with
```
<source>:23:15: error: static_assert expression is not an integral constant
expression
static_assert(test(S()));
^~~~~~~~~
<source>:14:3: note: delete of pointer that has already been deleted
delete m_ptr;
^
<source>:23:20: note: in call to '&S()->~S()'
static_assert(test(S()));
^
1 error generated.
Compiler returned: 1
```
This problem does not occur if `v` is turned into a local variable instead of a
function parameter.
See it live: <a href="https://godbolt.org/z/hcv88h">https://godbolt.org/z/hcv88h</a></pre>
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