{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":".map(|(x,"}]}
                    .map(|(x, _)| (lo.to(x.span), Some(x)))
                this.parse_expr_assoc_with(Bound::Excluded(op.unwrap().precedence()), attrs)
                    .map_err(|err| this.maybe_err_dotdotlt_syntax(maybe_lt, err))?