Fix subtraction.

2018-04-02 15:23:38 -04:00
parent b92b47d971
commit fa33de88db
1 changed files with 1 additions and 1 deletions
--- a/src/cryptonum/mod.rs
+++ b/src/cryptonum/mod.rs
@@ -499,7 +499,7 @@ impl<'a> SubAssign<&'a UCN> for UCN {
                        borrow = 0;
                    } else {
                        let x128 = (*x as u128) + 0x10000000000000000;
-                        let res = x128 - (*y as u128);
+                        let res = x128 - (*y as u128) - (borrow as u128);
                        *x = res as u64;
                        borrow = 1;
                    }