Function sp_state_machine::prove_child_read

pub fn prove_child_read<B, H, I>(
    mut backend: B, 
    child_info: &ChildInfo, 
    keys: I
) -> Result<StorageProof, Box<dyn Error>> where
    B: Backend<H>,
    H: Hasher,
    H::Out: Ord + Codec,
    I: IntoIterator,
    I::Item: AsRef<[u8]>, 

Generate child storage read proof.