ortant.png"></td>
<th align="left">Important</th>
</tr>
<tr><td align="left" valign="top"><p>
          Code executed by <span class="emphasis"><em>coroutine-function</em></span> must not prevent
          the propagation of the <span class="emphasis"><em>detail::forced_unwind</em></span> exception.
          Absorbing that exception will cause stack unwinding to fail. Thus, any
          code that catches all exceptions must re-throw any pending <span class="emphasis"><em>detail::forced_unwind</em></span>
