human
Solve the following python programming problem given the following code:
def compiled_library(self, node) : 
    ret = { 
        'sources' : [], 
        'include_dirs' : [], 
} 
    seen = set () 
    def _ensure_unique(field) : 
        if (field in seen) : 
            raise ValueError (('Field %r for compiled library %r is specified more than once !' % (field, ret ['name']))) 
else : 
            seen.add (field) 
def update(compiled_library_dict, c) : 
        if (c.type == 'name') : 
            ret ['name'] = c.value 
else : 
            if (c.type == 'sources') : 
                _ensure_unique ('sources') 
                ret ['sources'] = c.value 
else : 
                if (c.type == 'include_dirs') : 
                    _ensure_unique ('include_dirs') 
                    ret ['include_dirs'] = c.value 
else : 
                    raise ValueError (('Unknown node %s' % c)) 
for c in ([node.children [0]] + c.children [1]) : 
        update (ret, c) 
return Node ('compiled_library', value = ret) 

    
    

    Fix the buggy line: for c in ([node.children [0]] + c.children [1]) :
assistant
#Here is Python program to fix the buggy line: for c in ([node.

for c in ([node.children [0]] + node.children [1]) :