look up value in association list, using eql as test
Major Section:  PROGRAMMING

(Rassoc x alist) is similar to (assoc x alist), the difference being that it looks for the first pair in the given alist whose cdr, rather than car, is eql to x. See assoc.

The guard of rassoc requires its second argument to be an alist, and in addition, that either its first argument is eqlablep or else all second components of pairs belonging to the second argument are eqlablep. See eqlablep.

Rassoc is a Common Lisp function. See any Common Lisp documentation for more information.