awesomeFeature2.kt

@RequiresOptIn(message = "AmazingFeature should be checked")
@Retention(AnnotationRetention.BINARY)
@Target(AnnotationTarget.CLASS, AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY)
annotation class AmazingFeature
  
@AmazingFeature
fun brokenAmazingFeature() {
  TODO("aaaaa")
}
  
class HogeActivity {
  fun onClick() {
    brokenAmazingFeature() // Compile-time errors will be displayed!!!
  }
}