data ClientTls

service Bank {
  @public rpc balance(id: u64) -> i64
}

impl Bank {
  rpc balance(id) => 0
}

fn external() -> i64 | NetError net {
  let tls = ClientTls{ ca: "ca.pem" }
  Bank.connect("bank.example.org:7443", tls: tls).balance(1)
}