zcoord: Improve a test failure message

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/base/zcoord.rs b/base/zcoord.rs
index d95e7dc0fb8334088aa0b79faeddf46df64b499e..0cdf0572cf4fb45d9767715d11e6319ee26b10da 100644 (file)
--- a/base/zcoord.rs
+++ b/base/zcoord.rs
@@ -925,7 +925,7 @@ mod test {
         let got = self.i.next().unwrap();
         assert_eq!(got.to_string(), exp);
         assert_eq!(got, bf(exp));
-        assert!(got > self.last);
+        assert!(got > self.last, "{:?} <= {:?} !", &got, &self.last);
         self.last = got.clone();
       }
     }