Function next_entry 

pub fn next_entry<'a, I, P>(
    components: &mut Peekable<I>,
    tree: Data<'a>,
) -> ControlFlow<Option<EntryRef<'a>>, ObjectId>
where
    I: Iterator<Item = P>,
    P: PartialEq<BStr>,

Advance a path lookup by matching the next path component against tree.

components must yield the remaining path components to resolve, and tree must be the current object to search in.

The return value indicates how the caller should proceed:

• ControlFlow::Continue contains the object id of the matched entry when there are more components left to resolve. Callers should load that object and pass it back into a subsequent invocation.
• ControlFlow::Break(Some(entry)) contains the matched entry for the final component, and signals that lookup completed successfully.
• ControlFlow::Break(None) signals that lookup cannot continue and should stop without a match. This happens if tree is not a tree object, if components is already exhausted, or if the next component is not present in tree.

Note that this behaviour is tuned to prefer to exhaust the entire chain of components, only the last component can yield a ControlFlow::Break.