Function sc_consensus_aura::import_queue

pub fn import_queue<B, I, C, P, S>(
    slot_duration: SlotDuration, 
    block_import: I, 
    justification_import: Option<BoxJustificationImport<B>>, 
    finality_proof_import: Option<BoxFinalityProofImport<B>>, 
    client: Arc<C>, 
    inherent_data_providers: InherentDataProviders, 
    spawner: &S, 
    registry: Option<&Registry>
) -> Result<AuraImportQueue<B, TransactionFor<C, B>>, Error> where
    B: BlockT,
    C::Api: BlockBuilderApi<B> + AuraApi<B, <P as Pair>::Public> + ApiExt<B, Error = Error>,
    C: 'static + ProvideRuntimeApi<B> + BlockOf + ProvideCache<B> + Send + Sync + AuxStore + HeaderBackend<B>,
    I: BlockImport<B, Error = ConsensusError, Transaction = TransactionFor<C, B>> + Send + Sync + 'static,
    DigestItemFor<B>: CompatibleDigestItem<P>,
    P: Pair + Send + Sync + 'static,
    P::Public: Clone + Eq + Send + Sync + Hash + Debug + Encode + Decode,
    P::Signature: Encode + Decode,
    S: SpawnBlocking, 

Start an import queue for the Aura consensus algorithm.