human
Solve the following python programming problem given the following code:
@ nochange 
@ onlylib ('lxe') 
@ children 
def bench_xpath_old_extensions(self, children) : 
    def return_child(_, elements) : 
        if elements : 
            return elements [0] [0] 
else : 
            return () 
extensions = { 
        ('test', 'child') : return_child, 
} 
    xpath = self.etree.XPath ('t:child(.)', namespaces = { 
        't' : 'test', 
}, extensions = extensions) 
    for child in extensions : 
        xpath (child) 

    
    

    Fix the buggy line: for child in extensions :
assistant
#Here is Python code to fix the buggy line: for child in extensions :
.

for child in children :