- DOCUMENT@0..21
    - ENUM_TYPE_EXTENSION@0..21
        - extend_KW@0..6 "extend"
        - WHITESPACE@6..7 " "
        - enum_KW@7..11 "enum"
        - WHITESPACE@11..12 " "
        - NAME@12..21
            - IDENT@12..21 "Direction"
- ERROR@21:21 "expected Directive or Enum Values Definition" EOF
recursion limit: 500, high: 0