Dal (tezos-protocol-alpha.Tezos_raw_protocol

module Slot : sig ... end

module Denounced_delegates : 
  Storage_sigs.Indexed_data_storage
    with type t := Raw_context.t
     and type key =
           Tezos_protocol_environment_alpha.Signature.Public_key_hash.t
     and type value = unit

Set of delegates denounced in the current cycle. It is used to not distribute rewards for such delegates.