DSL EXPRESSION:
1 + 2 - 3


AST:
"block" [tt:block] [nt:StatementBlock]
    "-" [tt:op_minus] [nt:BareBoolean]
        "-" [tt:op_minus] [nt:Operator]
            "+" [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]

