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lang-hs
let ones = 1 : onesyou can compile it directly to something likeones = { push ones; push 1; jump (:) }, while with the desugared version,let ones = fix (\ self -> 1 : self), you have to recognise that you can inline the lambda and avoid the allocation of a thunk for the application of the lambda to its own application. Presumably it’s also more convenient to work with a group of recursiveletbindings than the same in terms offix.