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Kotlin notebook is cool for testing my custom HTML DSL framework

You can add a rendered for your type and it will be event cooler.

<@U04FW6TC6CX> Yep, if you add something like
```USE {
  render&lt;WH&gt;{ it.let { HTML(it.toString() } }
}```
in the beginning of your notebook, or in [the notebook integration](<https://github.com/Kotlin/kotlin-jupyter/blob/master/docs/libraries.md>) class, then objects of `WH` type will always be rendered in a correct way

Unfortunately my WH class is inline `value class` and the renderer doesn't seem to like working on it.

It's a value class over `StringBuilder` so I'm guessing the notebook is treating it like a stringbuilder.

Also whenever I change the code I always need to restart the runtime or I seemingly always get "exception during IR lowering" when running my code. Is this a bug or just a result of how the notebook works?

Here is the rendering when I manually call the HTML render function

Yes, Inline classes are not that stable in scripting implementation. It is possible to add a notebook-only extension like this:

```class WHWrapper(val value: VH)

fun WH(block: WH.()-&gt;Unit) = WHWrapper(WH().apply(block))```
Then add an integration for WHWrapper.

<@U04FW6TC6CX> please file a bug with exception during IR lowering <https://github.com/Kotlin/kotlin-jupyter|here>
It looks like a scripting bug

Regarding value classes: rendering is based on runtime reflection now, and this information is lost at runtime...Please vote for this issue: <https://github.com/Kotlin/kotlin-jupyter/issues/421>