- DOCUMENT@0..27
    - DIRECTIVE_DEFINITION@0..27
        - directive_KW@0..9 "directive"
        - WHITESPACE@9..10 " "
        - AT@10..11 "@"
        - NAME@11..18
            - IDENT@11..18 "example"
        - WHITESPACE@18..19 " "
        - on_KW@19..21 "on"
        - WHITESPACE@21..22 " "
        - DIRECTIVE_LOCATIONS@22..27
            - DIRECTIVE_LOCATION@22..27
                - FIELD_KW@22..27 "FIELD"
recursion limit: 500, high: 0