{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"attrs.iter().rfind(|(i,"}]}
                            attrs.iter().rfind(|(i, _)| ident == *i).map(|(_, binding)| *binding)
                        if let Some(binding) = this.helper_attrs.get(&expn_id).and_then(|attrs| {
                        }) {