Partially-inspected, finite stream representation.
Unlike Stream and Iter, represents an inspected stream head/tail.
public func make<X>(head : X) : Cell<X>
Construct one-value Cell from head (only)
public func nowLater<X>(now : X, later : () -> Cell<X>) : Cell<X>
Construct Cell from existing data "now" and data "later"
public func now<X>(later : ?(() -> Cell<X>)) : Cell<X>
Advance a cell's "later" half, getting it "now"
public func fromIter<X>(i : Iter.Iter<X>) : Cell<X>
Cell from (more lazy) Iter type.
Necessarily, tries to advance iterator, but (initially) just once.
public func toIter<X>(c : Cell<X>) : Iter.Iter<X>
Iter from (less lazy) Cell type.