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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - test/std/utilities/optional/optional.object/optional.object.ctor/move.fail.cpp has wrong assumption"
href="https://bugs.llvm.org/show_bug.cgi?id=41577">41577</a>
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<th>Summary</th>
<td>test/std/utilities/optional/optional.object/optional.object.ctor/move.fail.cpp has wrong assumption
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>zilla@kayari.org
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<p>
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<pre>std/utilities/optional/optional.object/optional.object.ctor/move.fail.cpp
This test assumes that move construction is not constexpr, based on this old
wording quoted in the test:
// constexpr optional(const optional<T>&& rhs);
// If is_trivially_move_constructible_v<T> is true,
// this constructor shall be a constexpr constructor.
That was replaced by <a href="https://wg21.link/p0602r4">https://wg21.link/p0602r4</a> and now it says:
"If is_trivially_move_constructible_v<T> is true, this constructor is trivial."
That means the constructor might still be constexpr even if it's non-trivial.
It's not clear to me whether the constructor is *required* to be constexpr, but
I think the test is wrong to assume the move construction *can't* be constexpr
(the test compiles using the std::optional from libstdc++, but 'lit' expects it
to be ill-formed).</pre>
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