<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/75707>75707</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clangd: Included header `<concepts>` incorrectly identified as unused
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          wangtz0607
      </td>
    </tr>
</table>

<pre>
    ## Example

```cpp
#include <concepts>

static_assert(std::same_as<int, int>);
```

## Actual Behavior


Changing `std::same_as` to other concepts defined in `<concepts>` such as `std::derived_from` and `std::convertible_to` yields the same behavior.

## Expected Behavior

`<concepts>` should not be identified as "not used directly" due to the presence of `std::same_as`.

## Environment

**`clangd --version`**:

```
clangd version 17.0.6
Features: linux
Platform: x86_64-unknown-linux-gnu
```

**Compiler flags specified in `compile_commands.json`**: `-std=c++20`.
</pre>
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