{"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"make::param(make::ident_pat(false,"}]}
        make::param(make::ident_pat(false, false, make::name(field_name)).into(), field_ty.clone());
    let field_param =
    let params = make::param_list(Some(make::mut_self_param()), [field_param]);