<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/73443>73443</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            libcxx relies on the existence of ::nullptr_t
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc++
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          Anton3
      </td>
    </tr>
</table>

<pre>
    libcxx's `<cstddef>` currently does:

```cpp
using nullptr_t = ::nullptr_t;
```

`::nullptr_t` comes from `<stddef.h>` (of libc++), which uses `#include_next` to make the compiler look into glibc's `<stddef.h>` for the definition of `::nullptr_t`.

Such behavior confuses some editors, notably CLion Nova, into thinking that `std::nullptr_t` does not exist, which turned off essentially all intellisense features.

The C++ Standard committee decided that `<stddef.h>` exposing `::nullptr_t` is a bug and that `std::nullptr_t` should not rely on `::nullptr_t`:
https://timsong-cpp.github.io/lwg-issues/3484
</pre>
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