{"ast_node_type":"variable","tokens":[{"end":57,"kind":"keyword","start":0,"text":"let"}]}
    let ref_types: Vec<ast::RefType> = match field_list {
fn find_ref_types_from_field_list(field_list: &ast::FieldList) -> Option<Vec<ast::RefType>> {
        ast::FieldList::RecordFieldList(record_list) => record_list