type WideCopyHolder {
    src: [2]u64,
    dst: [2]u64,
}

pub fn main(world: World) -> Void raises {
    var holder: WideCopyHolder = WideCopyHolder { src: [4294967296_u64, 8589934592_u64], dst: [0_u64, 0_u64] }
    let copied: usize = std.mem.copyItems(holder.dst, holder.src)
    let copiedWideValues: Bool = copied == 2 && holder.dst[0] == 4294967296_u64 && holder.dst[1] == 8589934592_u64
    if copiedWideValues {
        check world.out.write("std mem u64 copy items ok\n")
    }
}