Session session;
        Source globalToolchainsSource;
        Source userToolchainsSource;

        public ToolchainsBuilderRequestBuilder session(Session session) {
            this.session = session;
            return this;
        }

        public ToolchainsBuilderRequestBuilder globalToolchainsSource(Source globalToolchainsSource) {
            this.globalToolchainsSource = globalToolchainsSource;

     */
    @Nonnull
    default ToolchainsBuilderResult build(
            @Nonnull Session session, @Nonnull Source globalToolchainsSource, @Nonnull Source userToolchainsSource) {
        return build(ToolchainsBuilderRequest.build(session, globalToolchainsSource, userToolchainsSource));
    }