php-src/ext/zend_test/fiber.stub.php

<?php

/** @generate-class-entries static */

final class _ZendTestFiber
{
    public function __construct(callable $callback) {}

    public function start(mixed ...$args): mixed {}

    public function resume(mixed $value = null): mixed {}

    public function pipeTo(callable $callback): _ZendTestFiber {}

    public static function suspend(mixed $value = null): mixed {}
}