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-## Baby monads
-
-(Depends on lecture notes for safe division by zero.)
-
-Write a function `lift'` that generalized the correspondence between +
-and `add'`: that is, `lift'` takes any two-place operation on integers
-and returns a version that takes arguments of type `int option`
-instead, returning a result of `int option`.  In other words, `lift'`
-will have type:
-
-       (int -> int -> int) -> (int option) -> (int option) -> (int option)
-
-so that `lift' (+) (Some 3) (Some 4)` will evalute to `Some 7`.
-Don't worry about why you need to put `+` inside of parentheses.
-You should make use of `bind'` in your definition of `lift'`:
-
-       let bind' (u: int option) (f: int -> (int option)) =
-               match u with None -> None | Some x -> f x;;