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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Various problems with CTAD and disignated initialisers"
href="https://bugs.llvm.org/show_bug.cgi?id=51401">51401</a>
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<th>Summary</th>
<td>Various problems with CTAD and disignated initialisers
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>12.0
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>h2+bugs@fsfe.org
</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>All the code below builds with GCC>=10 and -std=c++20.
All except the two marked examples also build with MSVC.
Everything after "Outer2 o22" fails with Clang.
```c++
struct Inner
{
int i = 0;
};
struct Outer1
{
Inner s{};
};
template <typename T = int>
struct Outer2
{
Inner s{};
};
template <typename T>
struct Outer3
{
T s{};
};
int main()
{
Outer1 o1{};
Outer1 o2{{}};
Outer1 o3{Inner{}};
Outer1 o4{Inner{1}};
Outer1 o5{.s = Inner{}};
Outer1 o6{.s = Inner{ .i = 1}};
Outer2 o21{};
Outer2 o22{{}};
Outer2 o23{Inner{}}; // fails in MSVC
Outer2 o24{Inner{1}}; // fails in MSVC
Outer2 o25{.s = Inner{}};
Outer2 o26{.s = Inner{ .i = 1}};
Outer3 o33{Inner{}};
Outer3 o34{Inner{1}};
Outer3 o35{.s = Inner{}};
Outer3 o36{.s = Inner{ .i = 1}};
}
```</pre>
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