Although it looks impoverished, it's really just a foundation for developing your own abstractions, and syntactic sugar goes a long way (I've bound the Alt-> ke

Although it looks impoverished, it's really just a foundation for developing your own abstractions, and syntactic sugar goes a long way (I've bound the Alt-> key to → and use it for 'send'). CLOS-like systems can be built on structs with the racket/generic module and Typed Racket makes multimethods trivial.