pub fn storage_key_iter_with_suffix<K, T, H>(
    module: &[u8],
    item: &[u8],
    suffix: &[u8]
) -> PrefixIterator<(K, T), ()> ⓘwhere
    K: Decode,
    T: Decode,
    H: ReversibleStorageHasher,Expand description
Construct iterator to iterate over map items in module for the map called item.