DSL EXPRESSION:
(1 +  2) ** 3


AST:
"block" [tt:block] [nt:StatementBlock]
    "**" [tt:op_pow] [nt:BareBoolean]
        "**" [tt:op_pow] [nt:Operator]
            "+" [tt:op_plus] [nt:Parenthesized]
                "+" [tt:op_plus] [nt:Operator]
                    "1" [tt:int_literal] [nt:int_literal]
                    "2" [tt:int_literal] [nt:int_literal]
            "3" [tt:int_literal] [nt:int_literal]

