compiler/testData/codegen/box/smartCasts/kt17725.kt - third_party/github/JetBrains/kotlin - Git at Google

 class Bob {
     fun Bob.bar() = "OK"
 }

 fun Any.foo() = when(this) {
     is Bob -> bar()
     else -> throw AssertionError()
 }

 fun box(): String = Bob().foo()
	class Bob {
	fun Bob.bar() = "OK"
	}

	fun Any.foo() = when(this) {
	is Bob -> bar()
	else -> throw AssertionError()
	}

	fun box(): String = Bob().foo()