Positions.Iterator
API for iterating over positions in an efficient way
advance t ~skip
skips the next skip
positions in the sequence, advance to the next position and return it. Raises No_more
when reaching the end of the position set.
val advance_sexp_exn : t -> Sexplib0.Sexp.t -> range
Advance over a whole s-expression worth of positions. Returns the position range corresponding to that s-expression.