Code shared from the Rust Playground

playground.rs

    pub fn fmt_value_in(&self, f: &mut fmt::Write, denom: Denomination) -> fmt::Result {
		let sats = match self.as_sat().checked_abs() {
			Some(sats) => sats,
			None => {
				assert_eq!(self.as_sats(), i64::min_value());
				2147483648 // u64::max_value() - self.as_sat() as u64 + 1
			}
		};
        fmt_satoshi_in(sats, self.is_negative(), f, denom)
    }