Interface FnElem

interface FnElem {
    attributes?: AttributeElem[];
    body: StatementElem;
    contents: AbstractElem[];
    end: number;
    kind: "fn";
    name: DeclIdentElem;
    params: FnParamElem[];
    returnAttributes?: AttributeElem[];
    returnType?: TypeRefElem;
    start: number;
}