Для использования в качестве логического оператора краткой записи тип возвращаемого значения пользовательского логического оператора ("<var>X</var>") должен быть аналогичен типам двух его параметров

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In order to be applicable as a short circuit operator a user-defined logical operator ('<var>X</var>') must have the same return type as the type of its 2 parameters

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