(* spawn handler *)
Notation tvoidptr := (Tpointer Tvoid noattr).Notation tvoidfun := (Tfunction (Tcons tvoidptr Tnil) tvoidptr AST.cc_default).Definition f_wrapper : Clight.function :=
  {| Clight.fn_return := Tvoid; Clight.fn_callconv := AST.cc_default;
     Clight.fn_params := [(1%positive, tvoidfun); (2%positive, tvoidptr)];
     Clight.fn_vars := []; Clight.fn_temps := [];
     Clight.fn_body := Clight.Scall None (Clight.Etempvar 1%positive tvoidfun) [Clight.Etempvar 2%positive tvoidptr] |}.Class spawn_wrapper := { lookup_wrapper: exists b_wrapper, Genv.find_funct_ptr (Clight.genv_genv ge) b_wrapper = Some (Ctypes.Internal f_wrapper)}.Class spawn_wrapper := { lookup_wrapper: exists b_wrapper, Genv.find_funct_ptr (Clight.genv_genv ge) b_wrapper = Some (Ctypes.Internal f_wrapper)}.

Lemma match_ext: forall ef v2 t0 tyres te, match_states (Clight_new.ExtCall ef [v2] None Clight.empty_env te [Clight_new.Kseq (Clight.Sloop Clight.Sskip Clight.Sskip) ]) (CC'.CC_core_Callstate (Ctypes.External ef (Ctypes.Tcons t0 Ctypes.Tnil) tyres AST.cc_default) [v2] (Clight.Kcall None f_wrapper Clight.empty_env te (Clight.Kseq (Clight.Sloop Clight.Sskip Clight.Sskip) Clight.Kstop))).