wrote this yesterday, when i want to know if a item exists in a list.
(defun sequence-to-alist (mySequence) "Take a sequence mySequence and returns a association list. Each element's cdr is “t”. Example: (sequence-to-alist (list 3 4 5)) ⇒ ((3 . t) (4 . t) (5 . t)) This function is useful when you need to check a element is in a list, using `assoc' without loading CL library." (mapcar (lambda (ξx) (cons ξx t) ) mySequence))
ends up not using it. But, i think even if i need it, i probably should just use whichever is in the CL package. Btw, of you Common Lisp coders, what function would it be?
Answer: there's a elisp function member. (thanks to Elias Mårtenson.)