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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Unclear error message"
href="https://bugs.llvm.org/show_bug.cgi?id=39964">39964</a>
</td>
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<th>Summary</th>
<td>Unclear error message
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>7.0
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>jvapen@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
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<pre>test.cpp
========
struct A
{
A() = default;
A(A&&) {}
};
struct B : A
{
B() = default;
B(B&&) noexcept = default;
A a;
};
Error message:
==============
exception specification of explicitly defaulted move constructor does not match
the calculated one
see <a href="https://gcc.godbolt.org/z/lvQ6a_">https://gcc.godbolt.org/z/lvQ6a_</a>
The error message itself doesn't help me solving the problem.
I now know that B can't be nothrow-move-constructable.
However, I don't get told why this is the case.
For this specific case, I rather add 'noexcept' to class A, than removing it
from B.
Knowing where the 'calculated one' gets the different result from, allows me to
do so.</pre>
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