<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/64712>64712</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
[Clang] Add the ability to deprecated namespace aliases
</td>
</tr>
<tr>
<th>Labels</th>
<td>
enhancement,
clang:frontend
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
philnik777
</td>
</tr>
</table>
<pre>
Currently, there is no way to deprecate namespace aliases with Clang. It would be great to make this possible, since that makes it a lot less problematic to rename namespaces.
```c++
namespace my_new_ns {
struct S {};
}
[[deprecated]] namespace my_old_ns = my_new_ns;
my_old_ns::S a; // expected-warning {{my_old_ns is deprecated}}
my_new_ns::S b; // should not be diagnosed
```
</pre>
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