message: fix2
  Closes:
  Approved by: wqfish
diff: @@ -277,7 +277,7 @@ impl Arbitrary for InternalNode {
  fn arbitrary_with(_args: ()) -> Self::Strategy {
  hash_map(any::<Nibble>(), any::<Child>(), 1..=16)
  .prop_filter(
  - "InternalNode with only one leaf child is illegal",
  + "InternalNode constructor panics when its only child is a leaf.",
  |children| {
  !(children.len() == 1 && children.values().next().expect("Must exist.").is_leaf)
  },
  