op_heads: ensure that update_op_heads([id], id) fails

The doc states it's invalid, but I made such bug.
jj-vcs · Jan 2, 2024 · 25d5f61 · 25d5f61
1 parent 6edaa97
commit 25d5f61
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/lib/src/simple_op_heads_store.rs b/lib/src/simple_op_heads_store.rs
@@ -76,6 +76,7 @@ impl OpHeadsStore for SimpleOpHeadsStore {
     }
 
     fn update_op_heads(&self, old_ids: &[OperationId], new_id: &OperationId) {
+        assert!(!old_ids.contains(new_id));
         self.add_op_head(new_id);
         for old_id in old_ids {
             self.remove_op_head(old_id)