Requiem.QUIC.NIF.connection_on_timeout

You're seeing just the function connection_on_timeout, go back to Requiem.QUIC.NIF module for more information.
Link to this function

connection_on_timeout(conn)

Specs

connection_on_timeout(integer()) ::
  {:ok, non_neg_integer()} | {:error, :system_error | :already_closed}