Extended GCD on BigUint doesn't work

[mhogrefe]

use num::{BigUint, Integer, One};

fn main() {
    BigUint::one().extended_gcd(&BigUint::one());
}

fails with
thread 'main' panicked at 'Cannot subtract b from a because b is larger than a.'

Maybe the implementation should be specific to BigInt rather than being part of the Integer trait?

[cuviper]

Yeah, I regret not making that require Signed -- see rust-num/num-integer#40.

It's still useful in the Integer trait for other signed integer types, like i32.

[mhogrefe]

Thanks for responding! That makes sense. I'll close this since it's a dupe.