docs.rs failed to build bigint-1.0.4
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extern crate bigint;
use bigint::{U256, Uint};

fn main() {
		let mut val: U256 = 1023.into();
		for _ in 0..200 { val = val * 2.into() }
		assert_eq!(
			&format!("{}", val), 
			"1643897619276947051879427220465009342380213662639797070513307648"
		);
}