message: Fix clippy::match_wild_err_arm
diff: @@ -1583,10 +1583,7 @@ fn test_factor() {
  fn check(n: usize, s: &str) {
  let n = factor(n);
  - let ans = match BigUint::from_str_radix(s, 10) {
  - Ok(x) => x,
  - Err(_) => panic!(),
  - };
  + let ans = BigUint::from_str_radix(s, 10).unwrap();
  assert_eq!(n, ans);
  }
  