Add a hand-written error message for the seek_internal precondition

2021-06-02 16:28:27 -07:00
parent 01cfba0f8e
commit 2c8d5973f3
1 changed files with 6 additions and 1 deletions
@@ -413,7 +413,12 @@ where
        D: Dimension<'a, T::Summary>,
    {
        if let Some(target) = target {
-            debug_assert!(target.cmp(&self.seek_dimension, cx) >= Ordering::Equal);
+            debug_assert!(
+                target.cmp(&self.seek_dimension, cx) >= Ordering::Equal,
+                "cannot seek backward from {:?} to {:?}",
+                self.seek_dimension,
+                target
+            );
        }

        if !self.did_seek {