{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"err.subdiagnostic(errors::UnexpectedResChangeTyToConstParamSugg"}]}
            err.subdiagnostic(errors::UnexpectedResChangeTyToConstParamSugg {
        if let Some(param) = param {
                span: param.shrink_to_lo(),