<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/143694>143694</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [libc++] `basic_string_view` is exposed and depended by `bitset` before C++17
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          frederick-vs-ja
      </td>
    </tr>
</table>

<pre>
    Enabling `basic_string_view` before C++17 seems to be an intended extension but doesn't seem documented. I'm not sure whether we should provide a more pedantic option to disable it before C++17.

Also, libc++'s `bitset` depends on `basic_string_view` before C++17. It's possibly better (for the purpose of throughput) to avoid such dependency by decompose the `basic_string_view` parameter of `__init_from_string_view` into pointer and size. Should we make such change?
</pre>
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