Switch from test::black_box to std::hint::black_box

Author: dtolnay

benches/bench.rs

@@ -9,9 +9,10 @@
 
 extern crate test;
 
+use std::hint;
 use std::io::Write;
 use std::{f32, f64};
-use test::{black_box, Bencher};
+use test::Bencher;
 
 macro_rules! benches {
  ($($name:ident($value:expr),)*) => {
@@ -23,9 +24,9 @@ macro_rules! benches {
  let mut buf = ryu::Buffer::new();
 
  b.iter(move || {
- let value = black_box($value);
+ let value = hint::black_box($value);
  let formatted = buf.format_finite(value);
- black_box(formatted);
+ hint::black_box(formatted);
  });
  }
  )*
@@ -40,9 +41,9 @@ macro_rules! benches {
 
  b.iter(|| {
  buf.clear();
- let value = black_box($value);
+ let value = hint::black_box($value);
  write!(&mut buf, "{}", value).unwrap();
- black_box(buf.as_slice());
+ hint::black_box(buf.as_slice());
  });
  }
  )*