NonGenericFooBarEnumExtension.swift

extension FooBar {
    // Use this if you don't want to refactor your code.
    static func bar() -> FooBar {
        return .bar(())
    }
    
    // Use this if you want your code to be shorter.
    // It's all about your personal preferences.
    static var foo: FooBar {
        return .foo(())
    }
}