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kotlinlang

there's a 

```
     \--- org.jetbrains.kotlin:kotlin-android-extensions-runtime:1.2.21
```

in dependencies list, and `implementation`-only deps section does not list this lib, so I guess it's not restricted to the current module.

I suspect that configuration block

```
androidExtensions {
  experimental = true
}
```

gets applied only for `apply plugin: com.android.application` and not for `apply plugin: com.android.library` which is my case.

It works ok in other single-module app which I have