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Example on a Lisp Machine in ZetaLisp: Command: (zl:defun my-if zl:fexpr (form) (list :my-if form)) MY-IF Command: (my-if (> a b) a b) (:MY-IF ((> A B

by lispm 5y ago

Example on a Lisp Machine in ZetaLisp: Command: (zl:defun my-if zl:fexpr (form) (list :my-if form)) MY-IF Command: (my-if (> a b) a b) (:MY-IF ((> A B) A B)) Thus one can see that the original source of the arguments is bound to the symbol FORM as a list. A more recent language with FEXPRs seems to be the language R.