func (opt *Option) ArgFloat64Var(val *float64) error
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A 38-year-old man has been arrested after the statue of Winston Churchill outside the Houses of Parliament was defaced with graffiti calling the former prime minister a “Zionist war criminal”.
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then the += will modify the list, and then raise an exception because you can’t assign to that tuple item because the tuple is immutable, but the list will have been mutated.