Ah, yes, you're correct. Regardless of how an R function treats its arguments, it returns a result directly, never an unevaluated expression like a lisp macro.

Ah, yes, you're correct. Regardless of how an R function treats its arguments, it returns a result directly, never an unevaluated expression like a lisp macro. I didn't even know about FEXPRs (my main lisp is emacs lisp).