<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/71529>71529</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clangd incorrecly says 'header is unused'
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          kelbon
      </td>
    </tr>
</table>

<pre>
    Recently updated to llvm17 ~~(to get import std, but it is not yet available as i understand)~~ and If header used only in macro, then 


While i use it:
```cpp
#define $lock(... /* mtx or sequence of mtxs */) \
  ::std::scoped_lock UNIQUE_NAME {          \
    __VA_ARGS__ \
  }
struct my_mtx_t {};
void foo(...) {
  $lock(mtx, other.mtx);
}
```
Its pretty common, for example in llvm itself:

// file abc.def
```cpp
A(a)
A(b)
A(c)
```
And in file bcd.hpp

```cpp
#define A(name) use_header(name)
#include "abc.def"
```

P.S. when import std will be available?) I saw commit implementing it dated 9 Sep, but llvm17 do not contain it yet

</pre>
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