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Error HandlingA common way of handling failure that we’ve already seen is raising exceptions with failwith.For example:let rec find (l : 'a list) (pred : 'a -> bool) : 'a = match l with | ...

A construction likelet rec f ... = ...and g ... = ....allows f and g to be mutually recursive (if they were separate let recs, g could refer to f but not vice versa.)That is, in the caselet rec ...