DSL EXPRESSION:
$j = true; $j &&= $i < 2


AST:
* statement block
    * assignment "="
        * direct field value "j"
        * bool literal "true"
    * assignment "="
        * direct field value "j"
        * operator "&&"
            * direct field value "j"
            * operator "<"
                * direct field value "i"
                * int literal "2"

a   b   i x          y          j
pan pan 1 0.34679014 0.72680286 true
eks pan 2 0.75867996 0.52215111 false
wye wye 3 0.20460331 0.33831853 false
eks wye 4 0.38139939 0.13418874 false
