pub fn overrides_handle<C, BE>(client: Arc<C>) -> Arc<OverrideHandle<Block>> where
    C: 'static + Send + Sync + AuxStore + StorageProvider<Block, BE> + ProvideRuntimeApi<Block> + HeaderBackend<Block> + HeaderMetadata<Block, Error = Error>,
    C::Api: ApiExt<Block> + EthereumRuntimeRPCApi<Block> + ConvertTransactionRuntimeApi<Block>,
    BE: 'static + Backend<Block>,
    BE::State: StateBackend<Hashing>,