How to get rid of Error: 'spawn' takes a GC safe call expression with the redis client

[ray-delossantos]

@Araq

This doesn't work:

import  os, times, posix, logging, redis, threadpool

{.experimental.}

var running = true

proc proc_spawned()  =
  let redis_con = redis.open()
  defer: redis_con.quit

  while running == true:
    echo("bRPop")
    discard redis_con.bRPop("test", 1000)
    os.sleep(1000)

spawn proc_spawned()

The problem i identified, happens with Redis.bRPop proc, but doesn't happen with Redis.rPop proc.

proc bRPop*(r: Redis, keys: varargs[string], timeout: int): RedisList =
  ## Remove and get the *last* element in a list, or block until one
  ## is available.
  var args: seq[string] = @[]
  for i in items(keys): args.add(i)
  args.add($timeout)
  r.sendCommand("BRPOP", args)
  return r.readArray()