Proof using.
unfold update_elections_data_requestVote.
intros.
repeat break_match; auto.
Qed.

Lemma update_elections_data_requestVoteReply_leaderLogs :
forall h h' t  st t' ll' r,
In (t', ll') (leaderLogs (fst st)) ->
In (t', ll') (leaderLogs (update_elections_data_requestVoteReply h h' t r st)).