Opaque member_dec.

Lemma union_pred_local_facts: forall m {A} (P: forall it, A it -> val -> mpred)v p (R: forall it, A it -> Prop),
members_no_replicate m = true ->
(forall i v0, in_members i m -> P (i, field_type i m) v0 p |-- !! R _ v0) ->
union_pred m P v p |-- !! union_Prop m R v.