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kotlinlang

<https://youtu.be/x-FcOX6ErdI?t=14m6s>

In the above video at the provided timestamp, Florina is demonstrating how to utilize string annotations in order to style spans. I’ve followed the steps closely, but I seem to have hit a roadblock. In the code example, there appears to be a `key` field on the `Annotation` object. However, the inferred object by the compiler seems to be a Kotlin `interface` meant for compiler annotations. It is an empty interface. Am I meant to import a different `Annotation` type? I can’t find any documentation on this feature anywhere.