anchor.diff:              freeList.Add index |> ignore<bool>
           else freeIndex <- dec freeIndex
   
  -    type Ecs<'w> with
  +    type 'w Ecs with
   
           member this.IndexUnordered<'c when 'c : struct and 'c :> 'c Component> index =
               let systemOpt = this.TryIndexSystem<'c, SystemUnordered<'c, 'w>> ()
  
positive.code:         componentMultiplexed.Index.UnregisterMultiplexed multiId |> ignore<bool>
          this.UnregisterCorrelated entityId ecs
  
      type Ecs<'w> with
  
          member this.QualifyMultiplexed<'c when 'c : struct and 'c :> 'c Component> multiId entityId =
              let systemOpt = this.TryIndexSystem<'c, SystemMultiplexed<'c, 'w>> ()
  
negative.code:     inherit System<'w> (typeof<'c>.Name)
      let mutable comp = comp
      member this.Component with get () = &comp
      type 'w Ecs with
          member this.IndexSingleton<'c, 'w when 'c : struct and 'c :> 'c Component> () =
              let systemOpt = this.TryIndexSystem<'c, SystemSingleton<'c, 'w>> ()
              if Option.isNone systemOpt then failwith ("Could not find expected system '" + typeof<'c>.Name + "'.")
  