1 files changed, 12 insertions, 12 deletions

diff --git a/library/core/benches/fmt.rs b/library/core/benches/fmt.rs
index ff726ff75..d1cdb12e5 100644
--- a/library/core/benches/fmt.rs
+++ b/library/core/benches/fmt.rs
@@ -1,13 +1,13 @@
 use std::fmt::{self, Write as FmtWrite};
 use std::io::{self, Write as IoWrite};
-use test::Bencher;
+use test::{black_box, Bencher};
 
 #[bench]
 fn write_vec_value(bh: &mut Bencher) {
     bh.iter(|| {
         let mut mem = Vec::new();
         for _ in 0..1000 {
-            mem.write_all("abc".as_bytes()).unwrap();
+            mem.write_all(black_box("abc").as_bytes()).unwrap();
         }
     });
 }
@@ -18,7 +18,7 @@ fn write_vec_ref(bh: &mut Bencher) {
         let mut mem = Vec::new();
         let wr = &mut mem as &mut dyn io::Write;
         for _ in 0..1000 {
-            wr.write_all("abc".as_bytes()).unwrap();
+            wr.write_all(black_box("abc").as_bytes()).unwrap();
         }
     });
 }
@@ -29,7 +29,7 @@ fn write_vec_macro1(bh: &mut Bencher) {
         let mut mem = Vec::new();
         let wr = &mut mem as &mut dyn io::Write;
         for _ in 0..1000 {
-            write!(wr, "abc").unwrap();
+            write!(wr, "{}", black_box("abc")).unwrap();
         }
     });
 }
@@ -40,7 +40,7 @@ fn write_vec_macro2(bh: &mut Bencher) {
         let mut mem = Vec::new();
         let wr = &mut mem as &mut dyn io::Write;
         for _ in 0..1000 {
-            write!(wr, "{}", "abc").unwrap();
+            write!(wr, "{}", black_box("abc")).unwrap();
         }
     });
 }
@@ -51,7 +51,7 @@ fn write_vec_macro_debug(bh: &mut Bencher) {
         let mut mem = Vec::new();
         let wr = &mut mem as &mut dyn io::Write;
         for _ in 0..1000 {
-            write!(wr, "{:?}", "☃").unwrap();
+            write!(wr, "{:?}", black_box("☃")).unwrap();
         }
     });
 }
@@ -61,7 +61,7 @@ fn write_str_value(bh: &mut Bencher) {
     bh.iter(|| {
         let mut mem = String::new();
         for _ in 0..1000 {
-            mem.write_str("abc").unwrap();
+            mem.write_str(black_box("abc")).unwrap();
         }
     });
 }
@@ -72,7 +72,7 @@ fn write_str_ref(bh: &mut Bencher) {
         let mut mem = String::new();
         let wr = &mut mem as &mut dyn fmt::Write;
         for _ in 0..1000 {
-            wr.write_str("abc").unwrap();
+            wr.write_str(black_box("abc")).unwrap();
         }
     });
 }
@@ -82,7 +82,7 @@ fn write_str_macro1(bh: &mut Bencher) {
     bh.iter(|| {
         let mut mem = String::new();
         for _ in 0..1000 {
-            write!(mem, "abc").unwrap();
+            write!(mem, "{}", black_box("abc")).unwrap();
         }
     });
 }
@@ -93,7 +93,7 @@ fn write_str_macro2(bh: &mut Bencher) {
         let mut mem = String::new();
         let wr = &mut mem as &mut dyn fmt::Write;
         for _ in 0..1000 {
-            write!(wr, "{}", "abc").unwrap();
+            write!(wr, "{}", black_box("abc")).unwrap();
         }
     });
 }
@@ -104,7 +104,7 @@ fn write_str_macro_debug(bh: &mut Bencher) {
         let mut mem = String::new();
         let wr = &mut mem as &mut dyn fmt::Write;
         for _ in 0..1000 {
-            write!(wr, "{:?}", "☃").unwrap();
+            write!(wr, "{:?}", black_box("☃")).unwrap();
         }
     });
 }
@@ -115,7 +115,7 @@ fn write_str_macro_debug_ascii(bh: &mut Bencher) {
         let mut mem = String::new();
         let wr = &mut mem as &mut dyn fmt::Write;
         for _ in 0..1000 {
-            write!(wr, "{:?}", "Hello, World!").unwrap();
+            write!(wr, "{:?}", black_box("Hello, World!")).unwrap();
         }
     });
 }