def next.want
import bend-kit-journal@0.3.1.0/journal.bend as Journalimport Base
52def next.want(~P: Type, ~S: Type, ~cut: S -> @+hs:U32 -> @+len:U32 -> S & P, ~skip: S -> @+hs:U32 -> @+len:U32 -> S, ~sum: P -> P & U32, +len: U32, r: S & U32) -> Step<P, S>:
53 (s, +want) = r
54 next.cut(~P, ~S, ~skip, ~sum, want, len, cut(s, 12, len))