insert(_:)
Declaration
@discardableResult mutating func insert<ConcreteElement>(_ newMember: ConcreteElement) -> (inserted: Bool, memberAfterInsert: ConcreteElement) where ConcreteElement : Hashable@discardableResult mutating func insert<ConcreteElement>(_ newMember: ConcreteElement) -> (inserted: Bool, memberAfterInsert: ConcreteElement) where ConcreteElement : Hashable