public ToolchainsBuilderRequestBuilder userToolchainsSource(Source userToolchainsSource) {
            this.userToolchainsSource = userToolchainsSource;
            return this;
        }

        public ToolchainsBuilderRequest build() {
            return new ToolchainsBuilderRequestBuilder.DefaultToolchainsBuilderRequest(
                    session, globalToolchainsSource, userToolchainsSource);
        }