I must disagree. I see a lot of CAR and CDR calls in code that I see daily. Also, it's a style error to use FIRST and REST when one operates on cons cells, bec

I must disagree. I see a lot of CAR and CDR calls in code that I see daily. Also, it's a style error to use FIRST and REST when one operates on cons cells, because those imply a different meaning - that one operates on lists. Sure, the language doesn't care whether you use CAR or FIRST, but the programmer does - and they might know that you treat a cons cell as a pair unto its own, rather than an element of a linked list.