extra: Add a testcase for #7256.

src/libextra/time.rs

@@ -1138,6 +1138,9 @@ fn test(s: &str, format: &str) -> bool {
         assert!(result::unwrap(strptime("-0800", "%z")).tm_gmtoff ==
             0);
         assert!(test("%", "%%"));
+
+        // Test for #7256
+        assert_eq!(strptime("360", "%Y-%m-%d"), Err(~"Invalid year"))
     }
 
     fn test_ctime() {