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_norepet:
forall vl vs,
list_norepet (map (@fst _ _) vl) ->
match_globvars vl vs = true ->
list_norepet (map (@fst _ _) vs).