
        unwind the stack (stack is unwound by default).
      </p>
<p>
        Stack unwinding assumes the following preconditions:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            The coroutine is not <span class="emphasis"><em>not-a-coroutine</em></span>
          </li>
<li class="listitem">
            The coroutine is not complete
          </li>
<li class="listitem">
            The coroutine is not running
          </li>