I don't really think it was too long a problem to post on the mailing
list, and it would probably help others to list the code here anyway:

#let rec serialize_list string_list_a glue_a =
  begin
     match string_list_a with
     []         -> ""
     | head::rest -> (glue_with glue_a head (serialize_list rest
glue_a))
  end

;;
val serialize_list : string list -> string -> string = <fun>

# serialize_list ["a";"b";"c"] "--";;

- : string = "a--b--c--"

Your problem was simply one of syntax, look at what you wrote:

  | head::rest -> glue_with (glue_a head serialize_list( rest glue_a ))

Your function glue_with takes three parameters, not one.

Cheers,
Peter.

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