Github user yinxusen commented on the issue:
https://github.com/apache/spark/pull/13972
One small matter is that we can't use intersecting labels, e.g.
```scala
// $example on:init_session$
some code
// $example on:build_session$
some code
// $example off:init_session$
// $example off:build_session$
```
But this is a rare case I think. Otherwise LGTM.
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