Danger
Training exercise.

[migration-guide.md](/project29/migration-guide)

## What made you smile?

* This training was much easier than previous one.
* Code highlighting feature seems to be powerful and easy to use.


## What did you find confusing?

* Diff highlighting didn't work properly with horizontal scroll:
![code-highlights-diff-issue.png](/assets/code-highlights-diff-issue.34d4347c8e394046c90d2c5a439b718b202cbaf1e6383b0be28de9ddbcf59f9b.43a731ee.png)
* We were missing example from documentation to `add` range of lines like: `// [!code ++:15]`
* We wanted to highlight `catch` block after using `code++` syntax, but it seems that green and red layers take priority over highlights.