> 
> How to omit the syntax error in OCAML in CAML it runs.
> let hd = function
>     [] -> failwith "hd"
>   | a::l -> a;;
>  Characters 2-3:
>     | a::l -> a
>     ^
> Syntax error
> Mit freundlichen Gruessen
> Klaus Benecke

I do not see what is your problem exactly.
If I copy-paste your three lines in ocaml toplevel, I get :

$ ocaml
        Objective Caml version 3.06

# let hd = function
    [] -> failwith "hd"
  | a::l -> a;;
    val hd : 'a list -> 'a = <fun>

--Luc
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