fix benchmarks

Cargo.toml

@@ -27,7 +27,7 @@ clear_on_drop = { version = "0.2", default-features = false, features = ["nightl
 
 [dev-dependencies]
 hex = "0.3"
-criterion = "0.2"
+criterion = "0.3"
 bincode = "1"
 rand_chacha = "0.2"
 

benches/r1cs.rs

@@ -23,7 +23,8 @@ use bulletproofs::{BulletproofGens, PedersenGens};
 use curve25519_dalek::ristretto::CompressedRistretto;
 use curve25519_dalek::scalar::Scalar;
 use merlin::Transcript;
-use rand::{thread_rng, Rng};
+use rand::{Rng};
+use rand::seq::SliceRandom;
 
 // Shuffle gadget (documented in markdown file)
 
@@ -177,7 +178,7 @@ fn bench_kshuffle_prove(c: &mut Criterion) {
                 .map(|_| Scalar::from(rng.gen_range(min, max)))
                 .collect();
             let mut output = input.clone();
-            rand::thread_rng().shuffle(&mut output);
+            output.shuffle(&mut rand::thread_rng());
 
             // Make kshuffle proof
             b.iter(|| {
@@ -219,7 +220,7 @@ fn bench_kshuffle_verify(c: &mut Criterion) {
                     .map(|_| Scalar::from(rng.gen_range(min, max)))
                     .collect();
                 let mut output = input.clone();
-                rand::thread_rng().shuffle(&mut output);
+                output.shuffle(&mut rand::thread_rng());
 
                 let mut prover_transcript = Transcript::new(b"ShuffleBenchmark");