Function sc_consensus_aura::standalone::fetch_authorities_with_compatibility_mode

pub fn fetch_authorities_with_compatibility_mode<A, B, C>(
    client: &C,
    parent_hash: B::Hash,
    context_block_number: NumberFor<B>,
    compatibility_mode: &CompatibilityMode<NumberFor<B>>,
) -> Result<Vec<A>, Error>
where
    A: Codec + Debug,
    B: BlockT,
    C: ProvideRuntimeApi<B>,
    C::Api: AuraApi<B, A>,

Fetch the current set of authorities from the runtime at a specific block.

The compatibility mode and context block number informs this function whether to initialize the hypothetical block created by the runtime API as backwards compatibility for older chains.