Column.evacuate_pending: def of bendvy-ecs-core@0.1.0.3
Import: import bendvy-ecs-core@0.1.0.3/column.bend as Column
Lines 214-224 of bendvy-ecs-core@0.1.0.3/column.bend: https://jend.leeeet.dev/read.txt?path=bendvy-ecs-core@0.1.0.3/column.bend&start_line=214&end_line=224

import Base
import owner_handoff.bend as H

# The pending swap tuple is already fetched; zero fuel still moves that owner.
def evacuate_pending(~S:Data,~C:Type,fuel:Nat,+id:U32,rows:H.PrototypeHandoffRows<S,C>,observed:Array<Maybe<&1,C>> & Maybe<&1,C>) -> Array<Maybe<&1,C>> & H.PrototypeHandoffRows<S,C>:
  match fuel observed:
    case 0n, (values,None{}): (values,rows)
    case 0n, (values,Some{owner}): (values,H.HandoffCon{id,owner,rows})
    case 1n+rest, (values,None{}):
      +nextId = U32.sub(id,1)
      evacuate_pending(~S,~C,rest,nextId,rows,Array.swap(Maybe<&1,C>,values,U32.sub(nextId,1),None{}))
    case 1n+rest, (values,Some{owner}):
      +nextId = U32.sub(id,1)
      evacuate_pending(~S,~C,rest,nextId,H.HandoffCon{id,owner,rows},Array.swap(Maybe<&1,C>,values,U32.sub(nextId,1),None{}))

Uses (9):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array.swap
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  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.sub
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.3/owner_handoff.bend&name=PrototypeHandoffRows