Limit read size in `File::read_to_end` loop

This works around performance issues on  Windows by limiting reads the size of reads when the expected size is known.

1 files changed, 1 insertions, 1 deletions

diff --git a/library/std/src/io/tests.rs b/library/std/src/io/tests.rs
index f4a886d889a..6d30f5e6c6c 100644
--- a/library/std/src/io/tests.rs
+++ b/library/std/src/io/tests.rs
@@ -314,7 +314,7 @@ fn bench_read_to_end(b: &mut test::Bencher) {
     b.iter(|| {
         let mut lr = repeat(1).take(10000000);
         let mut vec = Vec::with_capacity(1024);
-        super::default_read_to_end(&mut lr, &mut vec)
+        super::default_read_to_end(&mut lr, &mut vec, None)
     });
 }