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I’m interested in how List.combine is done
val combine : 'a list -> 'b list -> ('a * 'b) list
Transform a pair of lists into a list of pairs: combine [a1; ...; an] [b1; ...; bn] is [(a1,b1); ...; (an,bn)].
Which implementation of SML? MosML, MLton and SML/NJ are all open source, so you should be able to just download the source code or look at it in your browser. Actually, the MosML implementation of ListPair is here, with zip right at the top, assuming that that’s the function you were talking about. It certainly does exactly what you described.