input: Write a function to detect and fix any potential errors in the given Python function. If the function modifies a mutable object while iterating over it, return a corrected version of the function. If there are no issues, return the original function. If the input function is empty, return an empty function.
  assert expand_list(lambda list: [item for item in list if list.remove(item)])==lambda list: [item for item in list if list.copy().remove(item)]
  assert expand_list(lambda list: [item for item in list if list.sort()])==lambda list: [item for item in list if list[:].sort()]
  assert expand_list(lambda list: [item for item in list if list.extend([1,2,3])])==lambda list: [item for item in list if list[:].extend([1,2,3])]
  assert expand_list(lambda list: [item for item in list if list.append(0)])==lambda list: [item for item in list if list[:].append(0)]
  assert expand_list(lambda list: list[])==lambda list: list
output: def expand_list(func):
      if func.__code__.co_code == b'':
          return lambda list: list
      func_code = func.__code__
      func_ast = ast.parse(func_code.co_code)
      for node in ast.walk(func_ast):
          if isinstance(node, ast.Call) and isinstance(node.func, ast.Attribute):
              if node.func.attr in ['remove', 'sort', 'extend', 'append']:
                  node.func.value = ast.Subscript(value=node.func.value, slice=ast.Slice(lower=None, upper=None, step=None), ctx=ast.Load())
      new_func_code = compile(func_ast, filename='', mode='eval')
      return types.FunctionType(new_func_code, func.__globals__, func.__name__, func.__defaults__, func.__closure__)