I’m novice in LISP, so I’m sorry in advance for probably non-clever question.
Now it is needed to check if the given symbol is a member of the given list of symbols. Function position works well for most cases, but the problem arises when the symbol is generated by gensym function:

(position ‘#:G808 (list ‘#:G808))

I expected 0 as a response for this query, but got nil instead. I suspect that # and : have some special meaning, but item '#:G808 anycase does belong to the list '#:G808 doesn’t it?