For backwards compatibility, if only a single input parameter is named _, then, within a lambda expression, _ is treated as the name of that parameter.
When _ is a valid discard, attempting to retrieve its value or use it in an assignment operation generates compiler error CS0301, "The name '_' does not exist in the current context".
А, это тут не применимо. Чот я затупил. Оно ж просто возвращается.