1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
fail success f1: Some(5) fail success f2: 5 fail success fail fail success fail fail fail success f3: Some(5) fail success fail success fail fail success fail fail fail success f4: 5