BendCollections.gather: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/spec/crypto/keccak/main.bend as BendCollections
Lines 47-52 of bend-collections@1.0.0.0/spec/crypto/keccak/main.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/spec/crypto/keccak/main.bend&start_line=47&end_line=52

import Base
import bend-collections@1.0.0.0/src/crypto/keccak/types.bend as T
import bend-collections@1.0.0.0/spec/crypto/keccak/permutation.bend as F

def gather(+round_count: Nat, n: Nat, +base: U32, +next: U32, +padding: Bool, +remain: Nat, s: T.State, acc: List<&2,U32>, pair: Array<U32> & U32) -> Array<U32> & T.State:
  match n pair:
    case 0n Tuple{a,w}:
      (a,F.rounds(round_count,0n,inject(s,prepare(padding,List.reverse(&2,U32,w <> acc),remain))))
    case 1n+p Tuple{a,w}:
      gather(round_count,p,base,U32.inc(next),padding,remain,s,w <> acc,Array.get(U32,a,U32.add(base,next)))

Uses (15):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array.get
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.reverse
  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=Sigma
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.inc
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/spec/crypto/keccak/main.bend&name=inject
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/spec/crypto/keccak/main.bend&name=prepare
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/spec/crypto/keccak/permutation.bend&name=rounds
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/keccak/types.bend&name=State