convert HSlice to varargs?

[oyster]

as we know 
    
    
    import bitOps
    
    var x = 1'u8
    x.setBits(0, 1, 2, 3)
    echo x
    
    
    Run

says `15`

and we can use HSlice to get the same result: 
    
    
    var x = 1'u8
    for i in 0 .. 3:
        x.setBits(i)
    echo x
    
    
    Run

but we can't use `x.setBits(0 .. 3)` directly. So is there a way to unpack an 
HSlice to be use as varargs? In python, a list can be used like this 
    
    
    a = [1, 2, 3]
    
    def f(x, y, z):
        print(x, y, z)
    
    f(*a)
    
    
    
    Run

which says `1 2 3`

thanks