> $awaitables * * @throws Exception\InvalidArgumentException If $awaitables is empty. * * @return T */ function first(iterable $awaitables): mixed { foreach (Awaitable::iterate($awaitables) as $first) { foreach ($awaitables as $awaitable) { if ($awaitable !== $first) { $awaitable->ignore(); } } return $first->await(); } throw new Exception\InvalidArgumentException('$awaitables must be a non-empty-iterable.'); }