ConnectError

    pub const ConnectError = error{
        AddressUnavailable,
        AddressFamilyUnsupported,
        /// Insufficient memory or other resource internal to the operating system.
        SystemResources,
        ConnectionPending,
        ConnectionRefused,
        ConnectionResetByPeer,
        HostUnreachable,
        NetworkUnreachable,
        Timeout,
        /// One of the `ConnectOptions` is not supported by the Io
        /// implementation.
        OptionUnsupported,
        /// Per-process limit on the number of open file descriptors has been reached.
        ProcessFdQuotaExceeded,
        /// System-wide limit on the total number of open files has been reached.
        SystemFdQuotaExceeded,
        ProtocolUnsupportedBySystem,
        ProtocolUnsupportedByAddressFamily,
        SocketModeUnsupported,
        /// The user tried to connect to a broadcast address without having the socket broadcast flag enabled or
        /// the connection request failed because of a local firewall rule.
        AccessDenied,
        /// Non-blocking was requested and the operation cannot return immediately.
        WouldBlock,
        NetworkDown,
    } || Io.Timeout.Error || Io.UnexpectedError || Io.Cancelable