context: ExampleWithTimeout failures

```
#!watchflakes
post <- pkg == "context" && test == "ExampleWithTimeout"
```

Issue created automatically to collect these failures.

Example ([log](https://build.golang.org/log/2fa8f3afdee7de00d43b64f2024ab60e49c93c9e)):

    --- FAIL: ExampleWithTimeout (0.02s)
    got:
    overslept
    want:
    context deadline exceeded


— [watchflakes](https://go.dev/wiki/Watchflakes)
