renamed kill_all to kill, in conformance with atp_kill command;
simplified/unified treatment of preferences;
check_thread_manager: CRITICAL due to global ref;
goal addressing via Thm.cprem_of;
reduced NJ basis library stuff to bare minimum;
structure Nat =
struct
datatype nat = Suc of nat | Zero_nat;
val one_nat : nat = Suc Zero_nat;
fun plus_nat (Suc m) n = plus_nat m (Suc n)
| plus_nat Zero_nat n = n;
fun times_nat (Suc m) n = plus_nat n (times_nat m n)
| times_nat Zero_nat n = Zero_nat;
end; (*struct Nat*)
structure Codegen =
struct
fun fac (Nat.Suc n) = Nat.times_nat (Nat.Suc n) (fac n)
| fac Nat.Zero_nat = Nat.one_nat;
end; (*struct Codegen*)