Function tc_client_api::backend::changes_tries_state_at_block

pub fn changes_tries_state_at_block<'a, Block: BlockT>(
    block: &BlockId<Block>, 
    maybe_storage: Option<&'a dyn PrunableStateChangesTrieStorage<Block>>
) -> Result<Option<ChangesTrieState<'a, HashFor<Block>, NumberFor<Block>>>>

Return changes tries state at given block.