Lemma update_elections_data_requestVoteReply_leaderLogs : forall h h' t r st, leaderLogs (update_elections_data_requestVoteReply h h' t r st) = leaderLogs (fst st) \/ leaderLogs (update_elections_data_requestVoteReply h h' t r st) = (currentTerm (snd st), log (snd st)) :: leaderLogs (fst st).