;; A dyn value's .field and [:key]: a read is get, an assignment is put.

defclass(State, [paused bool step bool])
defclass(Pos, [x y])
defclass(Body, [pos count items])

once state = State(false, false)

fn game-input() -> ()
  if true
    state.paused = not(state.paused)

fn main() -> i32
  game-input()
  println(state.paused)
  game-input()
  println(state.paused)
  let b = Body(Pos(1, 2), 0, [10 20 30])
  b.count += 1
  b.count += 1
  b.pos.x = 7
  b.pos.y *= 10
  b.items[0] = 11
  b.items[1] += 5
  println(b.count, b.pos.x, b.pos.y, b.items[0], b.items[1])
  let plain = {:a 1}
  println(plain.missing)
  let m = {:hp 3}
  m.hp -= 1
  m[:mp] = 9
  m[:mp] += 1
  m.name = "slime"
  println(m[:hp], m.mp, m[:gone], m)
  0