proposition: Lemma length_prefixes: forall {A: Type} (l: list A), length (prefixes l) = length l.
proof: Proof. intros. induction l; auto. simpl. f_equal. rewrite map_length. auto. Qed.
imports: Coq.Lists.List Coq.micromega.Lia Coq.Sorting.Permutation Coq.ZArith.ZArith_base Coq.ZArith.Zcomplements Coq.Logic.FunctionalExtensionality CertiGraph.lib.Coqlib CertiGraph.lib.EquivDec_ext VST.zlist.sublist VST.zlist.list_solver