Concurrency.fold: def of bend-kit-concurrency@0.2.0.0
Import: import bend-kit-concurrency@0.2.0.0/concurrency.bend as Concurrency
Lines 75-80 of bend-kit-concurrency@0.2.0.0/concurrency.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-concurrency@0.2.0.0/concurrency.bend&start_line=75&end_line=80

import Base

def fold(~A: Data, ~f: A -> A -> A, xs: List<A>, acc: A) -> A:
  match xs:
    case Nil{}:
      acc
    case h <> t:
      fold(~A, ~f, t, f(acc, h))

Uses (1):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List