;; a list of variables. The argument is a list of symbols (the names of
;; the variables). A list element can also be a list of two functions,
;; the first of which (when called with no arguments) gets the value, and
;; a list of variables. The argument is a list of symbols (the names of
;; the variables). A list element can also be a list of two functions,
;; the first of which (when called with no arguments) gets the value, and