Fix lints.

benches/benchs.rs

@@ -1,5 +1,4 @@
 #![feature(test)]
-#![feature(bench_black_box)]
 #![cfg(not(tarpaulin_include))]
 
 extern crate rand;

tests/integration.rs

@@ -1551,6 +1551,7 @@ fn test_hashmap_context_clone_debug() {
         .unwrap();
     context.set_value("variable_five".into(), 5.into()).unwrap();
     let context = context;
+    #[allow(clippy::redundant_clone)]
     let cloned_context = context.clone();
 
     assert_eq!(format!("{:?}", &context), format!("{:?}", &cloned_context));