human
Solve the following python programming problem given the following code:
@ with_setup (setup = cleanup) 
def test_recursion() : 
    def setup_cb() : 
        vim.vars ['result1'] = 0 
        vim.vars ['result2'] = 0 
        vim.vars ['result3'] = 0 
        vim.vars ['result4'] = 0 
        cmd = ('let g:result1 = rpcrequest(%d, "call", %d)' % (cid, 2)) 
        vim.command (cmd) 
        eq (vim.vars ['result1'], 4) 
        eq (vim.vars ['result2'], 8) 
        eq (vim.vars ['result3'], 16) 
        eq (vim.vars ['result4'], 32) 
        vim.stop_loop () 
def request_cb(name, args) : 
        n = args [0] 
        n *= 2 
        if (n <= 16) : 
            if (n == 4) : 
                cmd = ('let g:result2 = rpcrequest(%d, "call", %d)' % (cid, n)) 
else : 
                if (n == 8) : 
                    cmd = ('let g:result3 = rpcrequest(%d, "call", %d)' % (cid, n)) 
else : 
                    if (n == 16) : 
                        cmd = ('let g:result4 = rpcrequest(%d, "call", %d)' % (cid, n)) 
vim.command (cmd) 
return n 
vim.run_loop (setup_cb, None, setup_cb) 

    
    

    Fix the buggy line: vim.run_loop (setup_cb, None, setup_cb)
assistant
#Here is Python program to fix the buggy line: vim.

vim.run_loop (def request_cb(, None, setup_cb)