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I just noticed that if you have a gradle module in your project that defines a custom `RequiresOptIn` annotation, and another module that depends on that module and annotates some code with the custom annotation, the Kotlin compiler won’t actually enforce the opt-in if the dependency on the module containing the annotation is specified as `implementation` or `compileOnly` – it must be an `api` dependency.

Even weirder, the IDE (Android Studio Arctic Fox) actually _will_ still enforce the annotation with those other configurations – only command-line gradle builds don’t.

I haven’t seen any documentation about this requirement, and it doesn’t really make sense to me. Is this a gradle bug? A Kotlin bug? Kotlin gradle plugin bug? Or just expected behavior?

I think it will be better to open a new Kotlin issue

done: <https://youtrack.jetbrains.com/issue/KT-46065>