human
Solve the following python programming problem given the following code:
def cache_expressions(node) : 
    'Modifies the AST tree in place to reduce the duplicated computations.' 
    counts = defaultdict (int) 
    def count_func(pattern, node) : 
        name = node_name (node) 
        if (isinstance (name, tuple) and ('Operator' in name [0])) : 
            counts [name] += 1 
tile (node, [Pattern ()], count_func) 
    state = { 
        'last_id' : 0, 
} 
    replacements = { 
        
} 
    def repl_func(pattern, node) : 
        name = node_name (node) 
        if (name and (name in counts) and (counts [name] > 1)) : 
            if (name in replacements) : 
                return replacements [name] 
else : 
                cache_node = ast.CachedNode (node, state ['last_id']) 
                replacements [name] = cache_node 
                state ['last_id'] += 1 
                return cache_node 
tile (state, [Pattern ()], repl_func) 
    return node 

    
    

    Fix the buggy line: tile (state, [Pattern ()], repl_func)
assistant
#Here is Python code to fix the buggy line: tile (state, [Pattern ()], repl_func)
.

tile (node, [Pattern ()], repl_func)