Journal.next.start: def of bend-kit-journal@0.3.1.0
Import: import bend-kit-journal@0.3.1.0/journal.bend as Journal
Lines 86-94 of bend-kit-journal@0.3.1.0/journal.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-journal@0.3.1.0/journal.bend&start_line=86&end_line=94

import Base

# The two length fields are checked before the payload is waited for, so a damaged length is
# Bad and never a Torn tail that hides the frames after it.
def next.start(~P: Type, ~S: Type, ~fits: S -> @+at:U32 -> @+n:U32 -> S & Bool, ~u32: S -> @+at:U32 -> S & U32, ~cut: S -> @+hs:U32 -> @+len:U32 -> S & P, ~skip: S -> @+hs:U32 -> @+len:U32 -> S, ~sum: P -> P & U32, +max: U32, r: S & Bool) -> Step<P, S>:
  (s, both) = r
  match both:
    case True{}:
      next.len(~P, ~S, ~fits, ~u32, ~cut, ~skip, ~sum, max, u32(s, 0))
    case False{}:
      Short{s}

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-kit-journal@0.3.1.0/journal.bend&name=Step
  https://jend.leeeet.dev/definition.txt?path=bend-kit-journal@0.3.1.0/journal.bend&name=next.len