compiler/testData/codegen/box/directInvokeOptimization/unboundMemberRef.kt - third_party/github/JetBrains/kotlin - Git at Google

 // CHECK_BYTECODE_TEXT
 // 0 invoke

 fun box(): String =
     (String::plus)("O", "K")
	// CHECK_BYTECODE_TEXT
	// 0 invoke

	fun box(): String =
	(String::plus)("O", "K")