Iterators: reproducer for overflow on high end of iteration

src/ipv4.rs

@@ -614,4 +614,19 @@ mod test {
         assert_eq!(skynet.overlaps(other2), false);
         assert_eq!(other2.overlaps(other3), true);
     }
+
+    #[test]
+    fn edges() {
+        let low: Ipv4Network = "0.0.0.0/24".parse().unwrap();
+        let low_addrs: Vec<Ipv4Addr> = low.iter().collect();
+        assert_eq!(256, low_addrs.len());
+        assert_eq!("0.0.0.0".parse::<Ipv4Addr>().unwrap(), low_addrs[0]);
+        assert_eq!("0.0.0.255".parse::<Ipv4Addr>().unwrap(), low_addrs[255]);
+
+        let high: Ipv4Network = "255.255.255.0/24".parse().unwrap();
+        let high_addrs: Vec<Ipv4Addr> = high.iter().collect();
+        assert_eq!(256, high_addrs.len());
+        assert_eq!("255.255.255.0".parse::<Ipv4Addr>().unwrap(), high_addrs[0]);
+        assert_eq!("255.255.255.255".parse::<Ipv4Addr>().unwrap(), high_addrs[255]);
+    }
 }

src/ipv6.rs

@@ -589,4 +589,15 @@ mod test {
 
         assert_eq!(other2.overlaps(other), true);
     }
+
+    #[test]
+    fn edges() {
+        let low: Ipv6Network = "::0/120".parse().unwrap();
+        let low_addrs: Vec<Ipv6Addr> = low.iter().collect();
+        assert_eq!(256, low_addrs.len());
+
+        let high: Ipv6Network = "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ff00/120".parse().unwrap();
+        let high_addrs: Vec<Ipv6Addr> = high.iter().collect();
+        assert_eq!(256, high_addrs.len());
+    }
 }