IsFailed

:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

Check if this wait handle failed

final public function isFailed(): bool;

Returns

• bool - - A boolean indicating whether this wait handle failed

:::warning Deprecated: Use HH\Asio\has_failed() instead. :::