DSL EXPRESSION:
$a==1 ? $b == 2 : $c == 3


AST:
* statement block
    * bare boolean
        * operator "?:"
            * operator "=="
                * direct field value "a"
                * int literal "1"
            * operator "=="
                * direct field value "b"
                * int literal "2"
            * operator "=="
                * direct field value "c"
                * int literal "3"

