Definition var_name (V: Type) (bdec: ident * globvar V) : ident :=
   fst bdec.Definition no_dups (F V: Type) (fdecs: list (ident * F)) (bdecs: list (ident * globvar V)) : Prop :=
  list_norepet (map (@fst ident F) fdecs ++ map (@var_name V) bdecs).

Lemma assign_loc_fun: forall {cenv ty m b ofs v m1 m2}, assign_loc cenv ty m b ofs v m1 -> assign_loc cenv ty m b ofs v m2 -> m1=m2.