Program Definition funspec2jspec (ext_link: Strings.String.string -> ident) f : juicy_ext_spec Z :=
  Build_juicy_ext_spec _ (funspec2extspec ext_link f) _ _ _.Definition funspecs_norepeat (fs : funspecs) := list_norepet (map fst fs).Fixpoint add_funspecs_rec (ext_link: Strings.String.string -> ident) (Z : Type) (Espec : juicy_ext_spec Z) (fs : funspecs) :=
  match fs with
    | nil => Espec
    | cons (i,f) fs' => funspec2jspec Z (add_funspecs_rec ext_link Z Espec fs') ext_link (i,f)
  end.

Lemma add_funspecs_post (ext_link: Strings.String.string -> ident){Z Espec tret fs id sig cc A P Q NEP NEQ x ret m z ge_s} : let ef := EF_external id (funsig2signature sig cc) in funspecs_norepeat fs -> In (ext_link id, (mk_funspec sig cc A P Q NEP NEQ)) fs -> ext_spec_post (add_funspecs_rec ext_link Z Espec fs) ef x ge_s tret ret z m -> exists (phi0 phi1 phi1' : rmap) (x': sigT (fun ts => dependent_type_functor_rec ts A mpred)), join phi0 phi1 (m_phi m) /\ necR phi1' phi1 /\ JMeq x (phi1',x') /\ Q (projT1 x') (projT2 x') (make_ext_rval (filter_genv (symb2genv ge_s)) ret) phi0.