/**
* {@inheritdoc}
*/
public function getReturn()
{
if (null === $this->placeholder || null !== $this->awaitable) {
throw new UninitializedError('wait() must be called before calling this method.');
}
if (!$this->complete) {
throw new IncompleteError('The observable has not completed.');
}
if ($this->queue->isFailed()) {
throw $this->current;
}
return $this->current;
}
/**
* {@inheritdoc}
*/
public function isFailed() : bool
{
return $this->queue->isFailed();
}