Compose.prepend: def of bendvy-ecs-core@0.1.0.4
Import: import bendvy-ecs-core@0.1.0.4/compose.bend as Compose
Lines 194-198 of bendvy-ecs-core@0.1.0.4/compose.bend: https://jend.leeeet.dev/read.txt?path=bendvy-ecs-core@0.1.0.4/compose.bend&start_line=194&end_line=198

import Base
import world.bend as W
import transaction.bend as T

# Row outputs are committed only when the entire traversal succeeds.
def prepend(~S: Data,~Store: Type,~R: Type,~E: Data,~U: Data,~Out: Data,value: Out,observed: T.Tx<W.World<S,Store,R,E>,E> & (T.Outcome<Error<U>> & List<&2,Out>)) -> T.Tx<W.World<S,Store,R,E>,E> & (T.Outcome<Error<U>> & List<&2,Out>):
  (tx,result) = observed
  (outcome,values) = result
  (tx,(outcome,value <> values))

Uses (7):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  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=bendvy-ecs-core@0.1.0.4/compose.bend&name=Error
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/transaction.bend&name=Outcome
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/transaction.bend&name=Tx
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.4/world.bend&name=World