656     Fri = 4,  enumerator
675             Weekday::Thu => Weekday::Fri,  in succ()
676             Weekday::Fri => Weekday::Sat,  in succ()
694             Weekday::Fri => Weekday::Thu,  in pred()
695             Weekday::Sat => Weekday::Fri,  in pred()
712             Weekday::Fri => 5,  in number_from_monday()
730             Weekday::Fri => 6,  in number_from_sunday()
748             Weekday::Fri => 4,  in num_days_from_monday()
766             Weekday::Fri => 5,  in num_days_from_sunday()
780             Weekday::Fri => "Fri",  in fmt()
798             4 => Some(Weekday::Fri),  in from_i64()
812             4 => Some(Weekday::Fri),  in from_u64()
890             (Fri, "\"Fri\""),  in test_serde_serialize()
917             ("\"fri\"", Fri),  in test_serde_deserialize()
918             ("\"friday\"", Fri),  in test_serde_deserialize()