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use std::fmt; pub struct Terbilang<T> { number: T } impl<T> Terbilang<T> { pub fn new(number: T) -> Self { Terbilang{ number } } } impl<T> fmt::Display for Terbilang<T> { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "test") } }