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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - discarded statement and immediate invocation contexts are not mutually exclusive"
href="https://bugs.llvm.org/show_bug.cgi?id=52231">52231</a>
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<th>Summary</th>
<td>discarded statement and immediate invocation contexts are not mutually exclusive
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++2b
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>aaron@aaronballman.com
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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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<p>
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<pre>Clang currently rejects this valid C++2b program:
```
consteval int *make() { return new int; }
auto f() {
if constexpr (false) {
if consteval {
// Immediate function context, so call to `make()` is valid.
// Discarded statement context, so `return 0;` is valid too.
delete make();
return 0;
}
}
// FIXME: this error should not happen.
return 0.0; // expected-error {{'auto' in return type deduced as 'double'
here but deduced as 'int' in earlier return statement}}
}
```
<a href="https://godbolt.org/z/Y81nf63f7">https://godbolt.org/z/Y81nf63f7</a>
This seems to happen because we treat a discarded statement evaluation context
as being mutually exclusive with an immediate invocation, but as this code
shows, they are not mutually exclusive in practice.
See <a href="https://reviews.llvm.org/D112089">https://reviews.llvm.org/D112089</a> for details.</pre>
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