{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"this.expect_one_of(&[exp!(Comma)],"}]}
                this.expect_one_of(&[exp!(Comma)], &[exp!(CloseBrace)]).map(|x| {
                let span = lo.to(this.prev_token.span);
                    // Don't gate twice