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Safe multimethods in Racket (implemented as a library) (github.io)
4 points by Pauan 348 days ago | 1 comment


4 points by Pauan 347 days ago | link

The actual dispatch happens at runtime, but the cool thing is that it verifies that multimethods cannot overlap, and it does this verification at compile-time (specifically at macro-expand-time)

As complex as Racket is (especially its macro system), this is a good example of how that complexity can sometimes enable very cool things as a library (like compile-time verification of non-overlapping multimethods)

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