Use [pls1 pls2]
or (list pls1 pls2)
instead of '(pls1 pls2)
: '
is a quoting special form, which will not evaluate it's contents so you will have pls1
as a non-resolved symbol, not function:
(map class '(pls1 pls2)) => (clojure.lang.Symbol clojure.lang.Symbol)