usestd::ops::BitOrAssign;#[derive(Debug, PartialEq)]structPersonalPreferences {    likes_cats: bool,    likes_dogs: bool,}implBitOrAssignforPersonalPreferences {fnbitor_assign(&mutself, rhs:Self) {self.likes_cats |= rhs.likes_cats;self.likes_dogs |= rhs.likes_dogs;    }}letmutprefs = PersonalPreferences { likes_cats:true, likes_dogs:false};prefs |= PersonalPreferences { likes_cats:false, likes_dogs:true};assert_eq!(prefs, PersonalPreferences { likes_cats:true, likes_dogs:true});