class A {
  function a() {
    say("a");
    throw Error("erra");
    return 0;
  }
}

function b() {
  say("b");
  throw Error("errb");
  return 0;
}

function main[main] (var argv) {
  try {
    if (argv[1])
      return (new A).a();
    else
      return b();
  } catch (e) {
    say("caught exception");
  }
}