Don't generate leap seconds that are not 60 in NaiveTime's Arbitrary impl

Author: pitdicker

src/naive/time/mod.rs

@@ -208,9 +208,14 @@ pub struct NaiveTime {
 #[cfg(feature = "arbitrary")]
 impl arbitrary::Arbitrary<'_> for NaiveTime {
     fn arbitrary(u: &mut arbitrary::Unstructured) -> arbitrary::Result<NaiveTime> {
-        let secs = u.int_in_range(0..=86_399)?;
-        let nano = u.int_in_range(0..=1_999_999_999)?;
-        let time = NaiveTime::from_num_seconds_from_midnight_opt(secs, nano)
+        let mins = u.int_in_range(0..=1439)?;
+        let mut secs = u.int_in_range(0..=60)?;
+        let mut nano = u.int_in_range(0..=999_999_999)?;
+        if secs == 60 {
+            secs = 59;
+            nano += 1_000_000_000;
+        }
+        let time = NaiveTime::from_num_seconds_from_midnight_opt(mins * 60 + secs, nano)
             .expect("Could not generate a valid chrono::NaiveTime. It looks like implementation of Arbitrary for NaiveTime is erroneous.");
         Ok(time)
     }