Ask HN: What's the point of distinguishing lambda, block and proc in Ruby?

(I would have asked on #ruby but it's more interesting to hear from people with wider spectrum of language preferences)

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Distinguishing lambda, block and proc (function, sub) is traditional, and only in advanced lisp/FP circles people know of the equivalence.

Or do you mean technically? pure mini optimization. A block needs no signature/arg processing, and no name, a lambda needs no name. Otherwise they are the same. For the compiler they are almost the same.