Binding v1 doesn't generate code from augment of choice from uses in rpc

module augment-choice { 
    namespace "augment:choice";
    prefix "augchoi";
    revision 2018-01-25;

    grouping some-grouping {
        choice result {
            case no-success {
                container foo;
            }
        }
    }

//augment of choice in rpc doesn't work
    rpc some-rpc {
        output {
            uses some-grouping {
                augment result {
                    case success {
                        container bar;
                    }
                }
            }
        }
    }

//augment of choice in container works
    container some-cont { 
        uses some-grouping {
            augment result {
                case success {
                    container bar;
                }
            }
        }
    }
}