Inductive match_specs: forall (p: program) (G: funspecs), Prop :=
| match_specs_nil: match_specs nil nil
| match_specs_cons: forall i vars f p' P G',
not (In i (map (@fst _ _) p')) ->
match_specs p' G' ->
typecheck vars f = true ->
match_specs ((i,(vars,f))::p') ((i,P)::G').

Lemma cont_core: forall P i w, app_pred (cont P i) w <-> app_pred (cont P i) (core w).