Navigate from a node to its next sibling N times to reach the Nth sibling
right of the focus, or return Option.none if there are less than N trees to
the right of the focus.
When n is zero, the zipper is returned unchanged.
Will return Option.none if given negative indexes.
Navigate from a node to its next sibling N times to reach the Nth sibling right of the focus, or return
Option.noneif there are less than N trees to the right of the focus.When
nis zero, the zipper is returned unchanged.Will return
Option.noneif given negative indexes.See nextN for an unsafe version.
Type Param: A
The underlying type of the tree.
Param: self
The zipper that will be navigated.
Param: n
Number of siblings to skip to the left.
Returns
An updated zipper pointing at a new focus or
Option.none()ifnextcannot be repeated N times.