{"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"MissingTypesOrConsts"}]}
                MissingTypesOrConsts { .. } => {
                MissingLifetimes { .. } => ("at least ", self.num_expected_lifetime_args()),
                    ("at least ", self.num_expected_type_or_const_args_including_defaults())