Nim boilerplate

[xigoi]

Let me try…
    
    
    type
      Unit = object
        act: proc()
    func newMarine() =
      Unit(act: proc() = echo "marine acted")
    func newTank() =
      Unit(act: proc() = echo "tank acted")
    let units = [newMarine(), newTank()]
    for unit in units:
      unit.act
    
    
    Run

(replace `object` with `ref object` if you want reference semantics)