Stream.transfer.start: def of bend-kit-stream@0.3.1.0
Import: import bend-kit-stream@0.3.1.0/stream.bend as Stream
Lines 146-156 of bend-kit-stream@0.3.1.0/stream.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-stream@0.3.1.0/stream.bend&start_line=146&end_line=156

import Base

def transfer.start(~S: Type, ~D: Type,
  ~read: S -> U32 -> Bool -> U32 -> IO(S & Result<&1, &1, U32 & String, U32 & Array<U32>>),
  ~write: D -> U32 -> Array<U32> -> Bool -> IO(D & Result<&1, &1, U32 & String, Unit>),
  valid: Bool, source: S, destination: D, tls: Bool, chunk: U32, +cap: U32, ms: U32) ->
  IO(S & D & Outcome):
  match valid:
    case False{}:
      IO.pure(S & D & Outcome, (source, destination, Failed{0, BadChunk{}}))
    case True{}:
      transfer.loop(~S, ~D, ~read, ~write, 1n+U32.to_nat(cap),
        More{source, destination, 0}, tls, chunk, cap, ms)

Uses (16):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=IO
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=IO.pure
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  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=Base/base.bend&name=U32.to_nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Unit
  https://jend.leeeet.dev/definition.txt?path=bend-kit-stream@0.3.1.0/stream.bend&name=Error
  https://jend.leeeet.dev/definition.txt?path=bend-kit-stream@0.3.1.0/stream.bend&name=Outcome
  https://jend.leeeet.dev/definition.txt?path=bend-kit-stream@0.3.1.0/stream.bend&name=Transfer
  https://jend.leeeet.dev/definition.txt?path=bend-kit-stream@0.3.1.0/stream.bend&name=transfer.loop