{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"Some(errors::MissingKeywordForItemDefinition::EnumOrStruct"}]}
                Some(errors::MissingKeywordForItemDefinition::EnumOrStruct { span })
                // `S {}` could be unit enum or struct
            } else if self.look_ahead(2, |t| *t == token::Colon)