(** * Matching and memory injections. *)
Definition inj_of_bc (bc: block_classification) : meminj :=
fun b => match bc b with BCinvalid => None | _ => Some(b, 0) end.

Lemma inj_of_bc_valid:
forall (bc: block_classification) b, bc b <> BCinvalid -> inj_of_bc bc b = Some(b, 0).