Francois Colonna wrote:
> Hello,
> 
> very often I  have great difficulties to understand why I got a 
> compilation error in OCaml.
> Instead of polluting this list with low level questions I give the 
> erroneous code and the questions
> I have on the wiki page
> http://galileo.lct.jussieu.fr/~frames/WIKI/mediawiki/index.php/OCaml_Difficulty_serialize_list 
> 
> 
> I shall be very grateful if some of you would be interested to go there 
> and solve my problem.
> 
> François Colonna
> 

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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