Change to weak_rng.

benches/parabole.rs

@@ -50,9 +50,9 @@ impl Individual for Parabole {
     }
 
     fn mutate(&mut self) {
-        let between = Range::new(-1.0, 1.0);
+        let mut rng = rand::weak_rng();
 
-        let mut rng = rand::thread_rng();
+        let between = Range::new(-1.0, 1.0);
         let offset = between.ind_sample(&mut rng);
 
         self.x += offset;
@@ -104,7 +104,7 @@ fn criterion_benchmark(c: &mut Criterion) {
                     )
                     .map(|(a, b)| a.individual.mate(&b.individual))
                     .map(|individual| Wrapper {
-                        individual: individual,
+                        individual,
                         fitness: None,
                     })
                     .for_each(|wrapper| {
@@ -119,7 +119,7 @@ fn criterion_benchmark(c: &mut Criterion) {
                         individual.mutate();
 
                         Wrapper {
-                            individual: individual,
+                            individual,
                             fitness: None,
                         }
                     })