Use `T::BITS` instead of `size_of::<T> * 8`.

3 files changed, 4 insertions, 4 deletions

diff --git a/library/alloc/tests/lib.rs b/library/alloc/tests/lib.rs
index 03737e1ef1f..3ee0cfbe747 100644
--- a/library/alloc/tests/lib.rs
+++ b/library/alloc/tests/lib.rs
@@ -18,6 +18,7 @@
 #![feature(deque_range)]
 #![feature(inplace_iteration)]
 #![feature(iter_map_while)]
+#![feature(int_bits_const)]
 
 use std::collections::hash_map::DefaultHasher;
 use std::hash::{Hash, Hasher};
diff --git a/library/alloc/tests/string.rs b/library/alloc/tests/string.rs
index 4e604354122..a6e41b21b61 100644
--- a/library/alloc/tests/string.rs
+++ b/library/alloc/tests/string.rs
@@ -1,6 +1,5 @@
 use std::borrow::Cow;
 use std::collections::TryReserveError::*;
-use std::mem::size_of;
 use std::ops::Bound::*;
 
 pub trait IntoCow<'a, B: ?Sized>
@@ -605,7 +604,7 @@ fn test_try_reserve() {
     // on 64-bit, we assume the OS will give an OOM for such a ridiculous size.
     // Any platform that succeeds for these requests is technically broken with
     // ptr::offset because LLVM is the worst.
-    let guards_against_isize = size_of::<usize>() < 8;
+    let guards_against_isize = usize::BITS < 64;
 
     {
         // Note: basic stuff is checked by test_reserve
@@ -686,7 +685,7 @@ fn test_try_reserve_exact() {
     const MAX_CAP: usize = isize::MAX as usize;
     const MAX_USIZE: usize = usize::MAX;
 
-    let guards_against_isize = size_of::<usize>() < 8;
+    let guards_against_isize = usize::BITS < 64;
 
     {
         let mut empty_string: String = String::new();
diff --git a/library/alloc/tests/vec.rs b/library/alloc/tests/vec.rs
index 368ca4c5432..a49ca7c256a 100644
--- a/library/alloc/tests/vec.rs
+++ b/library/alloc/tests/vec.rs
@@ -1341,7 +1341,7 @@ fn test_try_reserve() {
     // on 64-bit, we assume the OS will give an OOM for such a ridiculous size.
     // Any platform that succeeds for these requests is technically broken with
     // ptr::offset because LLVM is the worst.
-    let guards_against_isize = size_of::<usize>() < 8;
+    let guards_against_isize = usize::BITS < 64;
 
     {
         // Note: basic stuff is checked by test_reserve