ExecutionReservationMaterialization.reason: def of bendvy-ecs-core@0.1.0.3
Import: import bendvy-ecs-core@0.1.0.3/execution_reservation_materialization.bend as ExecutionReservationMaterialization
Lines 22-27 of bendvy-ecs-core@0.1.0.3/execution_reservation_materialization.bend: https://jend.leeeet.dev/read.txt?path=bendvy-ecs-core@0.1.0.3/execution_reservation_materialization.bend&start_line=22&end_line=27

import Base
import bendvy-ecs-core@0.1.0.3/execution_reservation_bundle.bend as Bundle

# Preflight inspects actual presence without a callback or schema refresher.
# No incoming payload is initialized until the full tree has been checked.
def reason(ok:Bool,key:String) -> Maybe<&2,Bundle.Refusal>:
  match ok:
    case True{}:None{}
    case False{}:Some{Bundle.OccupiedFamily{key}}

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.3/execution_reservation_bundle.bend&name=Refusal