Amp\InvalidYieldError::__construct PHP Method

    public function __construct(\Generator $generator, string $prefix)
    {
        $yielded = $generator->current();
        $prefix .= \sprintf("; %s yielded at key %s", \is_object($yielded) ? \get_class($yielded) : \gettype($yielded), $generator->key());
        if (!$generator->valid()) {
            parent::__construct($prefix);
            return;
        }
        $reflGen = new \ReflectionGenerator($generator);
        $exeGen = $reflGen->getExecutingGenerator();
        if ($isSubgenerator = $exeGen !== $generator) {
            $reflGen = new \ReflectionGenerator($exeGen);
        }
        parent::__construct(\sprintf("%s on line %s in %s", $prefix, $reflGen->getExecutingLine(), $reflGen->getExecutingFile()));
    }