message: Fix dead_code warning for state_proof.
diff: @@ -228,6 +228,7 @@ impl Node {
  }
  }
  +#[allow(dead_code)] //FIXME remove after usage in main code
  pub fn verify_proof(proofs_rlp: &[u8], root_hash: &[u8], key: &str, expected_value: Option<&str>) -> bool {
  let nodes: Vec<Node> = UntrustedRlp::new(proofs_rlp).as_list().unwrap_or_default(); //default will cause error below
  let mut map: TrieDB = HashMap::new();
  