Definition Delta1 V G {C: compspecs}: tycontext :=
  make_tycontext ((1%positive,(Tfunction Tnil Tvoid cc_default))::nil) nil nil Tvoid V G nil.

Lemma match_globvars_in: forall i vl vs, match_globvars vl vs = true -> In i (map (@fst _ _) vs) -> In i (map (@fst _ _) vl).