# visible.ludic — L3: a program in no module uses what module bank exports: a function to call
# and an event to listen to. Its private `add` and `balance` stay out of reach.
#
# Running it prints:  42 42
import "bank"
program Visible {
  state VisibleState {
    heard: int = 0
  }
  @On(Deposited) handler Heard(visible_st: mut VisibleState) { visible_st.heard += amount }
  entry (bank_st: mut BankState, visible_st: VisibleState) {
    deposit(bank_st, 30)
    deposit(bank_st, 12)
    print(`{total(bank_st)} {visible_st.heard}`)
  }
}