<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/89084>89084</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang crashes when using invalid pack indexing (P2662R3)
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

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

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

<pre>
    Clang crashes with

```cpp
auto f(auto... x) -> (decltype(x)...)[0] {
 return AAA...[0];
}
```
https://godbolt.org/z/r7ohnsGGh
</pre>
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