End NESTED_RAMIF.

Lemma semax_extract_later_prop' {cs: compspecs}:
forall {Espec: OracleKind},
forall (Delta : tycontext) (PP : Prop) P Q R c post,
ENTAIL Delta, PROPx P (LOCALx Q (SEPx R)) |-- !!PP ->
(PP -> semax Delta (|>PROPx P (LOCALx Q (SEPx R))) c post) ->
semax Delta (|>PROPx P (LOCALx Q (SEPx R))) c post.