Referencing symbols in different files

Hello everyone,

I'm looking into LLVM and since one of the Kaleidoscope tutorials [1] is
written in OCaml, I thought it would be a good opportunity to a have 
a look at OCaml, too. Now I've got the example code on their page and
wanted to play with it in the REPL. 

However this does not work using »#use«:

tobias@akela ocaml [i] % ocaml
        OCaml version 4.01.0

# #load "dynlink.cma";;
# #load "camlp4o.cma";;
        Camlp4 Parsing version 4.01.0

# #use "token.ml";;
type token =
    Def
  | Var
  | Record
  | Type
  | For
  | If
  | Then
  | Else
  | End
  | While
  | Ident of string
  | Number of float
  | Operand of string
  | Kwd of char
# #use "lexer.ml";;
File "lexer.ml", line 23, characters 43-50:
Error: Unbound module Token

Since token is not defined in some module Token anymore. 
How can I load this code in REPL correctly and how does ocamlc.opt
know that token.ml constitues a module Token. By filename?

I tried using »#load« with token.cmo, too. But that didn't work either.

# #load "token.ml";;
File token.ml is not a bytecode object file.
# #load "_build/token.cmo";;
# Token.Kwd 'c';;
Error: Unbound module Token
# 

Thank you for your help,
Tobias

[1] http://llvm.org/docs/tutorial/OCamlLangImpl3.html