algorithm - adding a number to a list within a function OCaml -

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here have , error getting sadly 

error: function has type 'a * 'a list -> 'a list        applied many arguments; maybe forgot `;'.

why case? plan on passing 2 lists deleteduplicates function, sorted list, , empty list, , expect duplicates removed in list r, returned once original list reaches [] condition.

will updated code

let myfunc_caml_way arg0 arg1 = ...  rather  let myfunc_java_way(arg0, arg1) = ...  can call function in way:  myfunc_caml_way "10" 123  rather  myfunc_java_way("10, 123)

i don't know how useful might be, here code want, written in standard ocaml style. spend time making sure understand how , why works. maybe should start simpler (eg how sum elements of list of integers ?). actually, should start ocaml tutorial, reading , making sure aunderstand code examples. 

let deleteduplicates u =    (*     u : sorted list     v : result far     last : last element read u   *)   let rec aux u v last =      match u          [] -> v       | x::xs when x = last -> aux xs v last       | x::xs -> aux u (x::v) x   in   (* first element special case *)   match u       [] -> []     | x::xs -> list.rev (aux xs [x] x)

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