How to use closureScope to be used in thread?

[mashingan]

How to correctly capture variable to be used in proc which fed for a thread?
    
    
    type MyProc = proc(): void
    var threads: array[5, Thread[MyProc]]
    
    proc execThread(prc: MyProc) {.thread.} =
      echo "run ok"
      prc()
    
    for i in 0..threads.high:
      closureScope:
        threads[i].createThread execThread, proc () = echo i
    
    threads.joinThread
    

When above code was ran, the captured i only the last, not each i. Thanks in 
advance.