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[Caml-list] Newbie question concerning type definitions
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Date: 2001-10-11 (06:44)
From: Thomas Link <>
Subject: [Caml-list] Newbie question concerning type definitions

I have hesitated to send this question to this mailing list as I 
suspect it to be rather stupid. What am I trying to do? I would like to 
implement a simple stack based language in OCaml in order to get a 
feeling for OCaml and also to test some ideas. Well, I didn't get far 
as I wasn't even able to define the basic data structures. I guess this 
is plain wrong:

type returnState = Succeeded | Failed | Error of int
and proc = (stack -> dictionary -> returnState) 
and procs = proc list 
and element = 
	Int of int 
  | String of string
  | Float of float
  | Word of proc 
and stack = element Stack.t 
and dictionary = (string, procs) Hashtbl.t;; 

When compiling this, the compiler tells me that proc's definition is 
cyclic. How can I circumvent this in OCaml? 

My apologies if this is too simple-minded for being asked in this 
forum, but could somebody tell me please how the correct definition of 
these types could possibly look like? 

Cheers, Thomas. 

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