<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/78899>78899</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Validate valarray and slice operations
        </td>
    </tr>

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

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

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

<pre>
    https://github.com/llvm/llvm-project/issues/21320 mentions `valarray`'s multiplication compound assignment operator is not working properly with `slice_array`. The other standard `operator[]` proxy classes have the same issue. This is fixed by https://github.com/llvm/llvm-project/pull/76528.

This issue is not limited to compound assignment operators. `valarray op(valarray, valarray)`, `valarray op(valarray, value)`, and `valarray op(value, valarray)` have similar issues.

All functions for [valarrays](http://eel.is/c++draft/numarray) and `operator[]` proxies should be validated and fixed when needed.
This includes the compound operators for the proxy classes.


</pre>
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