{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"region_constraints:"}]}
            region_constraints: self.region_constraints.clone().fold_with(folder),
        TypeFolder::cx(folder).mk_external_constraints(ExternalConstraintsData {
            opaque_types: self.opaque_types.iter().map(|opaque| opaque.fold_with(folder)).collect(),