{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"ast::GenericArg::TypeArg(type_arg)"}]}
                ast::GenericArg::TypeArg(type_arg) => {
            match generic_arg {
                    let type_ref = self.lower_type_ref_opt(type_arg.ty(), impl_trait_lower_fn);