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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Diagnostics for "no matching constructor for initialization of ''" could be better"
href="https://bugs.llvm.org/show_bug.cgi?id=42363">42363</a>
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<th>Summary</th>
<td>Diagnostics for "no matching constructor for initialization of ''" could be better
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>lebedev.ri@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre><a href="https://godbolt.org/z/xxfpk7">https://godbolt.org/z/xxfpk7</a>
struct A {};
struct B {
explicit B(const A&, int a) {}
};
struct C {
C(const B&) {}
};
void test(const A& a) {
C c(a);
}
It rightfully complains that there is no way to convert A to C,
but never mentions the `explicit B(const A&, int a)`, and that it can't be
used because the value for the second argument is not present.
<a href="https://godbolt.org/z/EkOmZq">https://godbolt.org/z/EkOmZq</a>
struct A {};
struct B {
explicit B(const A&, int a = 0) {}
};
struct C {
C(const B&) {}
};
void test(const A& a) {
C c(a);
}
Same story, but even more surprising. It took me a moment to realize that
even if there is a default argument in `B`'s constructor,
it still wants it to be passed.</pre>
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