"Requests for specialized facilities and minor notational improvements are very common. When provided, they rarely fail to win applause. After all, if a feature is a direct solution to a problem and doesn’t significantly interact with other facilities, it is easy to explain, often easy to implement, and typically has a logically minimal expression leading to very concise pieces of code. People comparing languages using lists love such features. The snag is that the problems we face are essentially infinite, so we need an infinity of such specialized features."