- reified-slset-adjoin! RS SYM_1 ...procedure
Adds the SYM_i symbols not already in the reified slset RS parameter to the set, mutating it in-place. New symbols are added to the front of the list, but no guarantees are made about their order.
Runtime is O(n) on the number of symbols to be added.
Returns RS (for convenience only, the set is updated in-place).