collect for seq[set[int8]]

[HJarausch]

I don't understand **collect**. Given 
    
    
    type BS8 = set[int8]
    var S = collect(newSeq) :
      for i in 0..2 :  {} # how can specify which type of set, e.g. BS8, here?
    
    
    Run

Unfortunately this doesn't work 
    
    
    var S = collect(newSeq[BS8]) :
      ...
    
    
    Run

Thanks for a hint, Helmut