Replace criterion::black_box with std::hint::black_box

cedar-policy/benches/attr_errors.rs

@@ -17,7 +17,8 @@
 #![allow(clippy::unwrap_used)]
 use cedar_policy::EntityUid;
 use cedar_policy::{Authorizer, Context, Entities, PolicySet, Request, RestrictedExpression};
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use criterion::{criterion_group, criterion_main, Criterion};
+use std::hint::black_box;
 use std::str::FromStr;
 
 const LARGE_SIZE: usize = 100_000;

cedar-policy/benches/cedar_benchmarks.rs

@@ -18,14 +18,14 @@
 // PANIC SAFETY benchmarking
 #![allow(clippy::expect_used)]
 
-use std::str::FromStr;
+use std::{hint::black_box, str::FromStr};
 
 use cedar_policy::{
     Authorizer, Context, Entities, EntityId, EntityTypeName, EntityUid, Policy, PolicySet, Request,
     RestrictedExpression,
 };
 
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use criterion::{criterion_group, criterion_main, Criterion};
 
 pub fn criterion_benchmark(c: &mut Criterion) {
     let auth = Authorizer::new();

cedar-policy/benches/deeply_nested_est.rs

@@ -14,9 +14,11 @@
  * limitations under the License.
  */
 
+use std::hint::black_box;
+
 use cedar_policy::Policy;
 
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use criterion::{criterion_group, criterion_main, Criterion};
 
 // PANIC SAFETY: benchmarking
 #[allow(clippy::unwrap_used)]

cedar-policy/benches/entity_attr_errors.rs

@@ -21,9 +21,10 @@
 use cedar_policy::{
     Authorizer, Context, Entities, Entity, EntityUid, PolicySet, Request, RestrictedExpression,
 };
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use criterion::{criterion_group, criterion_main, Criterion};
 use std::{
     collections::{HashMap, HashSet},
+    hint::black_box,
     str::FromStr,
 };
 

cedar-policy/benches/entity_parsing.rs

@@ -1,11 +1,11 @@
 // PANIC SAFETY: it's ok for benchmarking code to panic
 #![allow(clippy::unwrap_used)]
 
-use std::str::FromStr;
+use std::{hint::black_box, str::FromStr};
 
 use cedar_policy::EntityTypeName;
 
-use criterion::{black_box, criterion_group, criterion_main, BenchmarkId, Criterion};
+use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion};
 
 fn entity_type_name_parsing(c: &mut Criterion) {
     let mut group = c.benchmark_group("EntityTypeName parsing");

cedar-policy/benches/extension_fn_validation.rs

@@ -14,11 +14,11 @@
  * limitations under the License.
  */
 
-use std::str::FromStr;
+use std::{hint::black_box, str::FromStr};
 
 use cedar_policy::{Policy, PolicySet, Schema, Validator};
 
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use criterion::{criterion_group, criterion_main, Criterion};
 
 // PANIC SAFETY: benchmarking
 #[allow(clippy::unwrap_used)]