.

wcfs/internal/xbtree.py

@@ -282,6 +282,7 @@ def Restructure(ztree, newStructure):
     # chain buckets via .next_bucket
     assert len(rbucketv) > 0
     for i in range(len(rbucketv)-1):
+        assert rbucketv[i].range.khi <= rbucketv[i+1].klo
         rbucketv[i].node.next_bucket = rbucketv[i+1].node
     rbucketv[-1].node.next_bucket = None