Definition prog_var_block (rho: environ) (il: list ident) (b: block) : Prop :=
  Exists (fun id => match ge_of rho id with Some b' => b'=b | _ => False end) il.

Lemma list_norepet_prog_funct': forall A B (vl: list (ident * globdef A B)), list_norepet (map (@fst _ _) vl) -> list_norepet (map (@fst _ _) (prog_funct' vl)).