Merge #75

75: Fix CheckedDiv with zeros r=cuviper a=cuviper



Co-authored-by: Josh Stone <cuviper@gmail.com>

Author: bors[bot]

src/lib.rs

@@ -773,6 +773,9 @@ where
 {
     #[inline]
     fn checked_div(&self, rhs: &Ratio<T>) -> Option<Ratio<T>> {
+        if rhs.is_zero() {
+            return None;
+        }
         let gcd_ac = self.numer.gcd(&rhs.numer);
         let gcd_bd = self.denom.gcd(&rhs.denom);
         let denom = (self.denom.clone() / gcd_bd.clone())
@@ -1942,6 +1945,14 @@ mod test {
             assert_eq!(small.checked_div(&big), None);
             assert_eq!(_1.checked_div(&_0), None);
         }
+
+        #[test]
+        fn test_checked_zeros() {
+            assert_eq!(_0.checked_add(&_0), Some(_0));
+            assert_eq!(_0.checked_sub(&_0), Some(_0));
+            assert_eq!(_0.checked_mul(&_0), Some(_0));
+            assert_eq!(_0.checked_div(&_0), None);
+        }
     }
 
     #[test]