the tuple keyword is not working

[maverk]

    var myTuple: tuple[int, string, float] = (42, "Nim", 3.14)
    echo myTuple[0]
    echo myTuple[1]
    echo myTuple[2]
    
    
    Run
    
    
    C:\Users\unknown\Documents\CODING\codes.nim(1, 38) Error: ':' or '=' 
expected, but got ']'
    
    
    Run