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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - wrong comparison category/crash involving user-defined conversions to builtin types"
href="https://bugs.llvm.org/show_bug.cgi?id=50591">50591</a>
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<th>Summary</th>
<td>wrong comparison category/crash involving user-defined conversions to builtin types
</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>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++2a
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>mizvekov@gmail.com
</td>
</tr>
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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>
<div>
<pre>Wrong comparison category is produced for classes with defaulted spaceship
operator which contain members with user-defined conversion operator to
integral type.
For builds with assertions enabled, this produces a crash instead for
conversions to any builtin type.
Reproduction:
```
#include <compare>
struct a1 {
operator int() const;
};
struct b1 {
auto operator<=>(b1 const &) const = default;
a1 f;
};
std::strong_ordering cmp_b1 = b1() <=> b1();
```
This will either result in:
* Incorrect diagnostic: error: no viable conversion from
'std::partial_ordering' to 'std::strong_ordering'
* Crash when assertions are enabled: Assertion failed: Cat && "no category for
builtin comparison?", file SemaDeclCXX.cpp
Workspace for convenience: <a href="https://godbolt.org/z/EasTWssje">https://godbolt.org/z/EasTWssje</a></pre>
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