Until now I had not connected the operator overloading table 'Dao.Interpreter.objInfixOpTable' into the interpreter, the instance of 'Dao.Interpreter.Executable' 'Dao.Interpreter.ArithExpr'. I have modified 'Dao.Interpreter.evalInfixOp' to make that connection. I will have to do the same for 'Dao.Interpreter.objUpdateOpTable' and 'Dao.Interpreter.objArithPfxOpTable'.