Instance TransfIfLink {A: Type} {LA: Linker A}
                      (flag: unit -> bool) (transf: A -> A -> Prop) (TL: TransfLink transf)
                      : TransfLink (match_if flag transf).(** Composing the [match_prog] relations above, we obtain the relation
  between CompCert C sources and Asm code that characterize CompCert's
  compilation. *)

Definition match_prog: Csyntax.program -> Asm.program -> Prop :=
  pass_match (compose_passes CompCert's_passes).

Theorem transf_c_program_match: forall p tp, transf_c_program p = OK tp -> match_prog p tp.