(set-remove! set argument) -> set
Destructively removes argument from set. If argument is not a member of set, does nothing. Always returns #f.
Examples:
Assuming for both that symbol alpha has been defined as [set 1 2 3 4]
>> (set-remove! alpha 2) :: #f >> alpha :: [set 1 3 4] >> (set-remove! alpha 8) :: #f >> alpha :: [set 1 3 4]