pavone@170: #{
pavone@170: 	sum <- :l {
pavone@170: 		l fold: 0 with: :acc el {
pavone@170: 			acc + el
pavone@170: 		}
pavone@170: 	}
pavone@170: 	main <- {
pavone@170: 		print: (string: (sum: [])) . "\n"
pavone@170: 		print: (string: (sum: [1 2 3 4])) . "\n"
pavone@170: 		print: (string: (sum: 1 | 2 | 3 | 4 | [])) . "\n"
pavone@170: 		print: (string: (sum: [1 2] . [3 4])) . "\n"
pavone@170: 	}
pavone@170: }