def availability

bendvy-ecs-core@0.1.0.4 · ordinary_machine_declaration.bend:47

import Base
import bendvy-ecs-core@0.1.0.4/machine.bend as M
import bendvy-ecs-core@0.1.0.4/world.bend as W

47# Preflight consults the actual nominal slot and preserves the arbitrary World.
48def availability(~S:Data,~Token:Data,~V:Data,~C:Type,~R:Type,~E:Data,name:String,observed:W.World<S,C,R,E> & M.Slot<S,Token,V>) -> W.World<S,C,R,E> & List<&2,String>:
49  match observed:
50    case (world,M.Missing{}):(world,[name])
51    case (world,M.Present{_,_,_,_}):(world,[])