<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/87561>87561</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [libc][assert] Define __STDC_VERSION_ASSERT_H__
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            good first issue,
            libc
      </td>
    </tr>

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

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

<pre>
    `7.2.5 Diagnostics <assert.h>` says:

> The macro __STDC_VERSION_ASSERT_H__ is an integer constant expression with a value equivalent to 202311L.

We should add that to libc/include/assert.h.def, then add a test like `VersionMacro` from libc/test/include/stdbit_test.cpp into a newly created file, perhaps called libc/test/include/assert_test.cpp.
</pre>
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