You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: podfile_validator.rb
    path of file: ./repos/CocoaPods/lib/cocoapods/installer
    
    the code of the file until where you have to start completion: module Pod
  class Installer
    # Valid
    
      def validate_installation_options
        installation_options = podfile.installation_options

        # Validate `incremental_installation` depends on `generate_multiple_pod_projects`
        invalid = installation_options.incremental_installation? && installation_options.incremental_installation != installation_options.generate_multiple_pod_projects
        add_error 'The installation option `incremental_installation` requires the option `generate_multiple_pod_projects` to also be enabled.' if invalid
      end