Raise an exception to the async generator

public function raise(
  HH\Exception $exception,
): Awaitable<?(Tk,Tv)>;

You should always await the returned Awaitable to get the actual key/value tuple.

If null is returned, that means you have reached the end of iteration.

You cannot call raise() without having the value returned from a previous call to raise(), next(), send(), having first awaited.


  • HH\Exception $exception

Return Values