Function fetch_operation_range 

pub async fn fetch_operation_range<F, Op, D, Error, Fetch, FetchFuture>(
    op_count: Location<F>,
    start_loc: Location<F>,
    max_ops: NonZeroU64,
    include_pinned_nodes: bool,
    fetch: Fetch,
) -> Result<FetchResult<F, Op, D>, Error>
where
    F: Family,
    D: Digest,
    Fetch: FnOnce(Location<F>, Location<F>, NonZeroU64, bool) -> FetchFuture,
    FetchFuture: Future<Output = Result<FetchedOperations<F, Op, D>, Error>>,

Fetch an operation range with a caller-provided callback and package it as a FetchResult.

Use this when the source returns the proof, operations, and optional pinned nodes together, such as a network get_operations request.