DSL EXPRESSION:
1  <  2  <  3


AST:
"block" [tt:block] [nt:StatementBlock]
    "<" [tt:op_lt] [nt:BareBoolean]
        "<" [tt:op_lt] [nt:Operator]
            "<" [tt:op_lt] [nt:Operator]
                "1" [tt:int_literal] [nt:int_literal]
                "2" [tt:int_literal] [nt:int_literal]
            "3" [tt:int_literal] [nt:int_literal]

