compiler/testData/codegen/box/when/emptyWhen.kt - third_party/github/JetBrains/kotlin - Git at Google

 enum class A { X1, X2 }

 fun box(): String {
     when {}
     when (A.X1) {}
     return "OK"
 }
	enum class A { X1, X2 }

	fun box(): String {
	when {}
	when (A.X1) {}
	return "OK"
	}