============
start
1: wait for subs
1.0.0: await fiber 0
1.0.1: cur fiber[0] is some: true
1.0.2: cur fiber[0] is some: true
1.0.3: res 0 = 0
1.1.0: await fiber 1
1.1.1: cur fiber[1] is some: true
1.1.2: cur fiber[1] is some: true
1.1.3: res 1 = 1
1.2.0: await fiber 2
1.2.1: cur fiber[2] is some: true
1.2.2: cur fiber[2] is some: true
1.2.3: res 2 = 2
1.3.0: await fiber 3
1.3.1: cur fiber[3] is some: true
1.3.2: cur fiber[3] is some: true
1.3.3: res 3 = 3
1.4.0: await fiber 4
1.4.1: cur fiber[4] is some: true
1.4.2: cur fiber[4] is some: true
1.4.3: res 4 = 4
2: main fiber done
3: main fiber exited
============
start
1: start fibers
1.7.1: I'm fiber 7 and I'm about to fail…
1.8.1: sub-fiber 8 was cancelled
1.9.1: sub-fiber 9 was cancelled
2.0: fiber 0 resolved as ok
2.1: fiber 1 resolved as ok
2.2: fiber 2 resolved as ok
2.3: fiber 3 resolved as ok
2.4: fiber 4 resolved as ok
2.5: fiber 5 resolved as ok
2.6: fiber 6 resolved as ok
2.7: fiber 7 resolved as error
2.8: fiber 8 resolved as error
2.9: fiber 9 resolved as error
3: wait for subs
4: await fiber 0
5: res 0 = 0
6: await fiber 1
7: res 1 = 1
8: await fiber 2
9: res 2 = 2
10: await fiber 3
11: res 3 = 3
12: await fiber 4
13: res 4 = 4
14: await fiber 5
15: res 5 = 5
16: await fiber 6
17: res 6 = 6
18: await fiber 7
19: main fiber cancelled with Failure("oh no!")
20: main fiber result: error Failure("oh no!")
21: main fib failed with "oh no!"
22: main fiber exited