proposition: Lemma frame2rootpairs'_app: forall r i al bl, frame2rootpairs' r i (al++bl) = frame2rootpairs' r i al ++ frame2rootpairs' r (i+Zlength al) bl.
proof: Proof. intros. revert i bl; induction al; simpl; intros. normalize. f_equal. rewrite IHal. f_equal. f_equal. rewrite Zlength_cons; lia. Qed.
imports: VST.veric.compcert_rmaps VST.msl.shares VST.msl.wand_frame VST.concurrency.conclib CertiGraph.lib.List_ext CertiGraph.msl_ext.log_normalize CertiGraph.msl_ext.ramification_lemmas CertiGraph.graph.graph_model CertiGraph.CertiGC.GCGraph CertiGraph.CertiGC.env_graph_gc CertiGraph.msl_ext.iter_sepcon Coq.Lists.List