structure ROOT =
struct
structure HOL =
struct
datatype boola = True | False;
fun nota False = True
| nota True = False;
fun op_conj y True = y
| op_conj x False = False
| op_conj True y = y
| op_conj False x = False;
end; (*struct HOL*)
structure IntDef =
struct
datatype nat = Zero_nat | Succ_nat of nat;
fun less_nat Zero_nat (Succ_nat n) = HOL.True
| less_nat n Zero_nat = HOL.False
| less_nat (Succ_nat m) (Succ_nat n) = less_nat m n;
fun less_eq_nat m n = HOL.nota (less_nat n m);
end; (*struct IntDef*)
structure Codegen =
struct
fun in_interval (k, l) n =
HOL.op_conj (IntDef.less_eq_nat k n) (IntDef.less_eq_nat n l);
end; (*struct Codegen*)
end; (*struct ROOT*)