#{
	sum <- :arr {
		cursum <- 0
		foreach: arr :idx el {
			cursum <- cursum + el
		}
		cursum
	}
	main <- {
		foo <- #[42 30 28]
		bar <- #[]
		bar append: 30
		bar append: 28
		bar append: 42
		(sum: foo) + (sum: bar)
	}
}