DSL EXPRESSION:
$x = !!1


AST:
"block" [tt:block] [nt:StatementBlock]
    "=" [tt:equals] [nt:Assignment]
        "$x" [tt:field_name] [nt:DirectFieldValue]
        "!" [tt:op_bang] [nt:Operator]
            "!" [tt:op_bang] [nt:Operator]
                "1" [tt:int_literal] [nt:int_literal]

