human
Solve the following python programming problem given the following code:
@ with_ioloop 
@ with_couchdb 
def test_delete_user(baseurl, ioloop) : 
    s = trombi.Server (baseurl, io_loop = ioloop) 
    user = [] 
    def add_callback(doc) : 
        assert (not doc.error) 
        user.append (doc) 
        ioloop.stop () 
s.add_user ('deletetest', 'test', add_callback) 
    ioloop.start () 
    def delete_callback(db) : 
        assert (not db.error) 
        assert isinstance (db, trombi.Database) 
        ioloop.stop () 
s.delete_user (add_callback [0], delete_callback) 
    ioloop.start () 

    
    

    Fix the buggy line: s.delete_user (add_callback [0], delete_callback)
assistant
#Here is Python program to fix the buggy line: s.

s.delete_user (user [0], delete_callback)