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