hi all,
I am a student and learning ocaml. need help for one
problem of Unbound value stack
here is my code.

type ins =PUSH of float| IADD|ISUB;;
type stack = ins list;;
type opn = Add|Sub;;
type exp = Num of float | Opn of exp* opn *exp;;

let rec compile exp=
match exp with 
Num x-> (PUSH x)::stack
|Opn e1,Add,e2 -> compile e2,
                  compile e1,
                  (IADD)::stack;;

gives error : unbound value stack????
 could any one clrify this???

thanks
maulin




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