seq[Foo[static[int]]] in cyclic types: type expected

[mratsim]

From #6510

import asyncdispatch, asyncnet

type
  ClientMsg[T] = object
    msg: T

  ServerMsg[T] = object
    msg: T

  MockupClient[T] = object
    server: ServerMsg[T]
    client: ClientMsg[T]

  Server[T; serverMsgSize, clientMsgSize: static[int]] = ref object
      socket: AsyncSocket
      mockupClients: seq[MockupClient[T]]
      newConnection: Future[tuple[address: string, client: AsyncSocket]]
      msgBuffer: array[serverMsgSize, byte]
      clients: seq[Client[T, serverMsgSize, clientMsgSize]]  # just seq[Client] compiles, nimsuggest underlines the static int types

  Client[T; serverMsgSize, clientMsgSize: static[int]] = ref object
      socket: AsyncSocket
      address: string
      msgBuffer: array[clientMsgSize, byte]
      newMsg: Future[int]
      server: Server[T, serverMsgSize, clientMsgSize]

cc @zah