Cancellation with WithCancel

Output:

worker 0 stopped after 2 steps: context canceled
worker 1 stopped after 2 steps: context canceled
worker 2 stopped after 2 steps: context canceled

Three goroutines run the same loop, and main stops all of them with one call to cancel. Each worker finishes two 40 ms steps, at 40 ms and 80 ms, and is partway through its third when main calls cancel at 100 ms. The ctx.Done() case is then ready, so the worker reports and returns. Each worker writes only its own element of reports, and wg.Wait makes main wait until all three have returned.

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