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validateAlias example

    protected function validate(mixed $config, string $name, string $path)
    {
        if (!\is_array($config)) {
            throw new \InvalidArgumentException(sprintf('The definition of "%s" in "%s" must be a YAML array.', $name, $path));
        }
        if (isset($config['alias'])) {
            $this->validateAlias($config, $name, $path);

            return;
        }
        if ($extraKeys = array_diff(array_keys($config), self::AVAILABLE_KEYS)) {
            throw new \InvalidArgumentException(sprintf('The routing file "%s" contains unsupported keys for "%s": "%s". Expected one of: "%s".', $path, $name, implode('", "', $extraKeys), implode('", "', self::AVAILABLE_KEYS)));
        }
        if (isset($config['resource']) && isset($config['path'])) {
            throw new \InvalidArgumentException(sprintf('The routing file "%s" must not specify both the "resource" key and the "path" key for "%s". Choose between an import and a route definition.', $path, $name));
        }
        if (!isset($config['resource']) && isset($config['type'])) {
            throw new \InvalidArgumentException(sprintf('The "type" key for the route definition "%s" in "%s" is unsupported. It is only available for imports in combination with the "resource" key.', $name, $path));
        }

$definition = $this->parseDefinition($service, $file, $defaults)
                    ->setTags(array_merge_recursive(['container.stack' => [[]]], $defaults->getTags()))
                ;
                $this->setDefinition($id = (string) $service->getAttribute('id'), $definition);
                $stack = [];

                foreach ($this->getChildren($service, 'service') as $k => $frame) {
                    $k = $frame->getAttribute('id') ?: $k;
                    $frame->setAttribute('id', $id.'" at index "'.$k);

                    if ($alias = $frame->getAttribute('alias')) {
                        $this->validateAlias($frame, $file);
                        $stack[$k] = new Reference($alias);
                    } else {
                        $stack[$k] = $this->parseDefinition($frame, $file, $defaults)
                            ->setInstanceofConditionals($this->instanceof);
                    }
                }

                $definition->setArguments($stack);
            } elseif (null !== $definition = $this->parseDefinition($service, $file, $defaults)) {
                if ('prototype' === $service->tagName) {
                    $excludes = array_column($this->getChildren($service, 'exclude'), 'nodeValue');