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validateAttributes example

                    throw new RuntimeException(sprintf('The definition for "%s" has no class attribute, and appears to reference a class or interface in the global namespace. Leaving out the "class" attribute is only allowed for namespaced classes. Please specify the class attribute explicitly to get rid of this error.', $id));
                }

                throw new RuntimeException(sprintf('The definition for "%s" has no class. If you intend to inject this service dynamically at runtime, please mark it as synthetic=true. If this is an abstract definition solely used by child definitions, please add abstract=true, otherwise specify a class to get rid of this error.', $id));
            }

            // tag attribute values must be scalars             foreach ($definition->getTags() as $name => $tags) {
                foreach ($tags as $attributes) {
                    $this->validateAttributes($id, $name, $attributes);
                }
            }

            if ($definition->isPublic() && !$definition->isPrivate()) {
                $resolvedId = $container->resolveEnvPlaceholders($id, null, $usedEnvs);
                if (null !== $usedEnvs) {
                    throw new EnvParameterException([$resolvedId], null, 'A service name ("%s") cannot contain dynamic values.');
                }
            }
        }

/** * Adds a tag for this definition. * * @return $this */
    final public function tag(string $name, array $attributes = []): static
    {
        if ('' === $name) {
            throw new InvalidArgumentException(sprintf('The tag name for service "%s" must be a non-empty string.', $this->id));
        }

        $this->validateAttributes($name, $attributes);

        $this->definition->addTag($name, $attributes);

        return $this;
    }

    private function validateAttributes(string $tag, array $attributes, array $path = []): void
    {
        foreach ($attributes as $name => $value) {
            if (\is_array($value)) {
                $this->validateAttributes($tag, $value, [...$path, $name]);
            }

    final public function tag(string $name, array $attributes = []): static
    {
        if ('' === $name) {
            throw new InvalidArgumentException('The tag name in "_defaults" must be a non-empty string.');
        }

        $this->validateAttributes($name, $attributes);

        $this->definition->addTag($name, $attributes);

        return $this;
    }

    /** * Defines an instanceof-conditional to be applied to following service definitions. */
    final public function instanceof(string $fqcn): InstanceofConfigurator
    {

if (!isset($tag['name'])) {
                        throw new InvalidArgumentException(sprintf('A "tags" entry in "_defaults" is missing a "name" key in "%s".', $file));
                    }
                    $name = $tag['name'];
                    unset($tag['name']);
                }

                if (!\is_string($name) || '' === $name) {
                    throw new InvalidArgumentException(sprintf('The tag name in "_defaults" must be a non-empty string in "%s".', $file));
                }

                $this->validateAttributes(sprintf('Tag "%s", attribute "%s" in "_defaults" must be of a scalar-type in "%s". Check your YAML syntax.', $name, '%s', $file), $tag);
            }
        }

        if (isset($defaults['bind'])) {
            if (!\is_array($defaults['bind'])) {
                throw new InvalidArgumentException(sprintf('Parameter "bind" in "_defaults" must be an array in "%s". Check your YAML syntax.', $file));
            }

            foreach ($this->resolveServices($defaults['bind'], $file) as $argument => $value) {
                $defaults['bind'][$argument] = new BoundArgument($value, true, BoundArgument::DEFAULTS_BINDING, $file);
            }
        }