/**
* Finalize the coroutine.
*
* This method is invoked after the coroutine is popped from the call stack.
*
* @param StrandInterface $strand The strand that is executing the coroutine.
*/
public function finalize(StrandInterface $strand)
{
foreach ($this->substrands as $strand) {
$strand->removeListener('exit', [$this, 'onStrandExit']);
}
}