{"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"//"}]}
            // Only try to parse if it is an inner attribute (has `!`).
            let start_pos = self.num_bump_calls;
            let attr = if self.check(exp!(Pound)) && self.look_ahead(1, |t| t == &token::Bang) {