compiler/testData/cli/jvm/optInEmptyMessage.kt - third_party/github/JetBrains/kotlin - Git at Google

 @RequiresOptIn(message = " ")
 annotation class EmptyMarker

 @EmptyMarker
 fun foo() {}

 fun bar() {
     foo()
 }
	@RequiresOptIn(message = " ")
	annotation class EmptyMarker

	@EmptyMarker
	fun foo() {}

	fun bar() {
	foo()
	}