message: Fix benchmark due to anchor change in witness.
diff: @@ -19,7 +19,7 @@ use sapling_crypto::primitives::{
  };
  use bellman::groth16::*;
  use rand::{XorShiftRng, SeedableRng, Rng};
  -use pairing::bls12_381::Bls12;
  +use pairing::bls12_381::{Bls12, Fr};
  const TREE_DEPTH: usize = 32;
  @@ -36,7 +36,8 @@ fn main() {
  payment_address: None,
  commitment_randomness: None,
  ar: None,
  - auth_path: vec![None; TREE_DEPTH]
  + auth_path: vec![None; TREE_DEPTH],
  + anchor: None
  },
  rng
  ).unwrap();
  @@ -78,6 +79,7 @@ fn main() {
  let commitment_randomness: fs::Fs = rng.gen();
  let auth_path = vec![Some((rng.gen(), rng.gen())); TREE_DEPTH];
  let ar: fs::Fs = rng.gen();
  + let anchor: Fr = rng.gen();
  let start = Instant::now();
  let _ = create_random_proof(Spend {
  @@ -87,7 +89,8 @@ fn main() {
  payment_address: Some(payment_address),
  commitment_randomness: Some(commitment_randomness),
  ar: Some(ar),
  - auth_path: auth_path
  + auth_path: auth_path,
  + anchor: Some(anchor)
  }, &groth_params, rng).unwrap();
  total_time += start.elapsed();
  }
  