Enabling compression on socket send/receive.

[void09]

I tried to get a proc as field in my client object, so i can swap it at runtime 
without having if else everywhere.

I have these definitions:
    
    
    proc sendProcU(nntp: NNTP | AsyncNNTP, data: string) {.multisync.} =
      await nntp.sock.send(data)
      
      NNTPClientBase*[SocketType] = ref object
    ...
        sendProc*: proc(nntp: NNTP | AsyncNNTP, data: string)
      
      NNTP*      = NNTPClientBase[Socket]
      AsyncNNTP* = NNTPClientBase[AsyncSocket]
    
    proc new(T: typedesc[NNTP | AsyncNNTP], host: string, port: Port, tlsPort = 
port, user, pass: string, tls: bool): T =
      result = T(host: host, port: port, tlsPort: tlsPort, user: user, pass: 
pass)
      when T is NNTP:
        result.sock = newSocket()
        result.sendProc = (proc (nntp: NNTP, data: string))sendProcU
      else:
        result.sock = newAsyncSocket()
        result.sendProc = (proc (nntp: AsyncNNTP, data: string))sendProcU
    
    
    Run

This results in the error: ` Error: generic instantiation too nested` at the 
last line where the sendProc field is assigned. Any idea what I am doing wrong 
and how to fix it ?