Navigate from a node to its next sibling or return Option.none if the focused node is the last node in its forest.
Option.none
See next for an unsafe version.
The underlying type of the tree.
An updated zipper pointing at a new focus or Option.none() if there is no next sibling.
Option.none()
Navigate from a node to its next sibling or return
Option.noneif the focused node is the last node in its forest.See next for an unsafe version.