protected function parseShortOption($token, values\Options $options, array& $input) : void
    {
        // Remove the starting hyphen.
        // If it's just a hyphen and nothing else, ignore it since it's most likely a mistype.
        if (empty($shortcut = substr($token, 1))) {
            return;
        }

        foreach ($this->resolveShortOption($shortcut, $options) as $name => $value) {
            $options->set($name, $value);
        }
    }