fun test(receiver: Any?, fn: @ExtensionFunctionType Function3<Any, Int, String, Unit>): Unit? {
  return { // BLOCK
    val tmp_0: Any? = receiver
    when {
      EQEQ(arg0 = tmp_0, arg1 = null) -> null
      else -> fn.invoke(p1 = tmp_0, p2 = 42, p3 = "Hello")
    }
  }
}