Function sp_state_machine::prove_child_read_on_trie_backend

pub fn prove_child_read_on_trie_backend<S, H, I>(
    trie_backend: &TrieBackend<S, H>, 
    child_info: &ChildInfo, 
    keys: I
) -> Result<StorageProof, Box<dyn Error>> where
    S: TrieBackendStorage<H>,
    H: Hasher,
    H::Out: Ord + Codec,
    I: IntoIterator,
    I::Item: AsRef<[u8]>, 

Generate storage read proof on pre-created trie backend.