contract Events =
  type alias_int = int
  type alias_address = address
  type alias_string = string

  datatype event =
      Event1(indexed alias_int, indexed int, string)
    | Event2(alias_string, indexed alias_address)
    | BadEvent1(indexed string, string)
    | BadEvent2(indexed int, int)
    | BadEvent3(indexed alias_string, string)
    | BadEvent4(indexed int, alias_address)

  function f1(x : int, y : string) =
    Chain.event(Event1(x, x+1, y))

  function f2(s : string) =
    Chain.event(Event2(s, Call.caller))

  function f3(x : int) =
    Chain.event(Event1(x, x + 2, Int.to_str(x + 7)))

  function i2s(i : int) = Int.to_str(i)
  function a2s(a : address) = Address.to_str(a)