Hdr.len.pick: def of bend-toon-codec@0.1.0.0
Import: import bend-toon-codec@0.1.0.0/src/hdr.bend as Hdr
Lines 129-134 of bend-toon-codec@0.1.0.0/src/hdr.bend: https://jend.leeeet.dev/read.txt?path=bend-toon-codec@0.1.0.0/src/hdr.bend&start_line=129&end_line=134

import Base

def len.pick(+ok: Bool, +n: Maybe<&2, U32>, +rest: String) -> Result<&2, &2, String, Hdr>:
  match ok n:
    case True{} Some{v}:
      delim(v, rest)
    case _ _:
      bad("invalid array length")

Uses (8):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-toon-codec@0.1.0.0/src/hdr.bend&name=Hdr
  https://jend.leeeet.dev/definition.txt?path=bend-toon-codec@0.1.0.0/src/hdr.bend&name=bad
  https://jend.leeeet.dev/definition.txt?path=bend-toon-codec@0.1.0.0/src/hdr.bend&name=delim