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proc working(source: seq[int]): seq[int] =
    result = newSeq[int](len(source))
    for i in 0..<source.len:
        result[i] = source[i]

proc broken(source: seq[int]): seq[int] = 
    var p = newSeq[int](len(source))
    for i in 0..<source.len:
        p[i] = source[i]

    return p

var source = newSeq[int](3)
source[0] = 1
source[1] = 2
source[2] = 3

let copy1 = working(source)
let copy2 = broken(source)

echo "orig: ", source
echo "copy 1: ", copy1
echo "copy 2:", copy2