contract NameClash =

  function double_proto : () => int
  function double_proto : () => int

  function proto_and_def : int => int
  function proto_and_def(n) = n + 1

  function double_def(x) = x
  function double_def(y) = 0

  // abort, put and state are builtin
  function abort() : int = 0
  function put(x) = x
  function state(x, y) = x + y