Library function to find difference between two lists - OCaml

Question

Is there a library function to find List1 minus elements that appear in List2? I've been googling around and haven't found much.

It doesn't seem too trivial to write it myself. I've written a function to remove a specific element from a list but that's much more simple:

let rec difference l arg = match l with
| [] -> []
| x :: xs -> 
    if (x = arg) then difference xs arg
    else x :: difference xs arg;;

Answer 1

Will this do?

let diff l1 l2 = List.filter (fun x -> not (List.mem x l2)) l1

Answer 2

What I ended up actually doing was just writing another function which would call the first one I posted

let rec difference l arg = match l with
    | [] -> []
    | x :: xs -> 
        if (x = arg) then difference xs arg
        else x :: difference xs arg;; 

let rec list_diff l1 l2 = match l2 with
    | [] -> l1
    | x :: xs -> list_diff (difference l1 x) xs;;

Although the solution I accepted is much more elegant