{"ast_node_type":"variable","tokens":[{"end":82,"kind":"keyword","start":0,"text":"let"}]}
                let scope_tree = self.fcx.tcx.region_scope_tree(self.fcx.body_id);
            fn is_sub_scope(&self, sub_id: hir::ItemLocalId, super_id: hir::ItemLocalId) -> bool {
                if let Some(sub_var_scope) = scope_tree.var_scope(sub_id)