[Caml-list] actualize a string

[Flavio Leonardo Cavalcanti de Moura <flavio@mat.unb.br>]

	I am trying to build a procedure such that some reductions are
performed while a list (of redex) is not empty. The problem is that a
new list is needed at each step otherwise it will loop for ever. The
actual code is

let normal exp =
 let l = exp :: [] in
 while (matchingApp exp [] []) <> [] do
       exp := (appreduction exp (hd (matchingApp exp [] [])));
       exp :: l done; l;;

After the 'while' I would like to actualize the expression 'exp' with the
string (appreduction exp (hd (matchingApp exp [] []))). The problem is
that with := it does not work. How can I do that? I couldn't find anything
in the ocaml manual.

	Best regards,
  	Flávio Leonardo.


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