6 files changed, 13 insertions, 16 deletions
diff --git a/library/alloc/tests/arc.rs b/library/alloc/tests/arc.rs
index a259c0131ec..0baa50f439b 100644
--- a/library/alloc/tests/arc.rs
+++ b/library/alloc/tests/arc.rs
@@ -1,7 +1,6 @@
 use std::any::Any;
 use std::cell::{Cell, RefCell};
 use std::iter::TrustedLen;
-use std::mem;
 use std::sync::{Arc, Weak};
 
 #[test]
@@ -129,7 +128,7 @@ fn shared_from_iter_trustedlen_normal() {
         let vec = iter.clone().collect::<Vec<_>>();
         let rc = iter.collect::<Rc<[_]>>();
         assert_eq!(&*vec, &*rc);
-        assert_eq!(mem::size_of::<Box<u16>>() * SHARED_ITER_MAX as usize, mem::size_of_val(&*rc));
+        assert_eq!(size_of::<Box<u16>>() * SHARED_ITER_MAX as usize, size_of_val(&*rc));
 
         // Clone a bit and let these get dropped.
         {
@@ -145,7 +144,7 @@ fn shared_from_iter_trustedlen_normal() {
         let vec = iter.clone().collect::<Vec<_>>();
         let rc = iter.collect::<Rc<[_]>>();
         assert_eq!(&*vec, &*rc);
-        assert_eq!(0, mem::size_of_val(&*rc));
+        assert_eq!(0, size_of_val(&*rc));
         {
             let _rc_2 = rc.clone();
             let _rc_3 = rc.clone();
diff --git a/library/alloc/tests/rc.rs b/library/alloc/tests/rc.rs
index 451765d7242..9d82a7621a2 100644
--- a/library/alloc/tests/rc.rs
+++ b/library/alloc/tests/rc.rs
@@ -1,7 +1,6 @@
 use std::any::Any;
 use std::cell::{Cell, RefCell};
 use std::iter::TrustedLen;
-use std::mem;
 use std::rc::{Rc, Weak};
 
 #[test]
@@ -125,7 +124,7 @@ fn shared_from_iter_trustedlen_normal() {
         let vec = iter.clone().collect::<Vec<_>>();
         let rc = iter.collect::<Rc<[_]>>();
         assert_eq!(&*vec, &*rc);
-        assert_eq!(mem::size_of::<Box<u16>>() * SHARED_ITER_MAX as usize, mem::size_of_val(&*rc));
+        assert_eq!(size_of::<Box<u16>>() * SHARED_ITER_MAX as usize, size_of_val(&*rc));
 
         // Clone a bit and let these get dropped.
         {
@@ -141,7 +140,7 @@ fn shared_from_iter_trustedlen_normal() {
         let vec = iter.clone().collect::<Vec<_>>();
         let rc = iter.collect::<Rc<[_]>>();
         assert_eq!(&*vec, &*rc);
-        assert_eq!(0, mem::size_of_val(&*rc));
+        assert_eq!(0, size_of_val(&*rc));
         {
             let _rc_2 = rc.clone();
             let _rc_3 = rc.clone();
diff --git a/library/alloc/tests/slice.rs b/library/alloc/tests/slice.rs
index f990a41b679..2516563187f 100644
--- a/library/alloc/tests/slice.rs
+++ b/library/alloc/tests/slice.rs
@@ -1,7 +1,7 @@
 use std::cmp::Ordering::{Equal, Greater, Less};
 use std::convert::identity;
 use std::rc::Rc;
-use std::{fmt, mem, panic};
+use std::{fmt, panic};
 
 fn square(n: usize) -> usize {
     n * n
@@ -73,7 +73,7 @@ fn test_len_divzero() {
     let v0: &[Z] = &[];
     let v1: &[Z] = &[[]];
     let v2: &[Z] = &[[], []];
-    assert_eq!(mem::size_of::<Z>(), 0);
+    assert_eq!(size_of::<Z>(), 0);
     assert_eq!(v0.len(), 0);
     assert_eq!(v1.len(), 1);
     assert_eq!(v2.len(), 2);
diff --git a/library/alloc/tests/sort/known_good_stable_sort.rs b/library/alloc/tests/sort/known_good_stable_sort.rs
index f8615435fc2..2df89146253 100644
--- a/library/alloc/tests/sort/known_good_stable_sort.rs
+++ b/library/alloc/tests/sort/known_good_stable_sort.rs
@@ -5,7 +5,7 @@
 // Based on https://github.com/voultapher/tiny-sort-rs.
 
 use alloc::alloc::{Layout, alloc, dealloc};
-use std::{mem, ptr};
+use std::ptr;
 
 /// Sort `v` preserving initial order of equal elements.
 ///
@@ -26,7 +26,7 @@ pub fn sort<T: Ord>(v: &mut [T]) {
 
 #[inline(always)]
 fn stable_sort<T, F: FnMut(&T, &T) -> bool>(v: &mut [T], mut is_less: F) {
-    if mem::size_of::<T>() == 0 {
+    if size_of::<T>() == 0 {
         return;
     }
 
@@ -166,7 +166,7 @@ struct BufGuard<T> {
 impl<T> BufGuard<T> {
     // SAFETY: The caller has to ensure that len is not 0 and that T is not a ZST.
     unsafe fn new(len: usize) -> Self {
-        debug_assert!(len > 0 && mem::size_of::<T>() > 0);
+        debug_assert!(len > 0 && size_of::<T>() > 0);
 
         // SAFETY: See function safety description.
         let layout = unsafe { unwrap_unchecked(Layout::array::<T>(len).ok()) };
diff --git a/library/alloc/tests/thin_box.rs b/library/alloc/tests/thin_box.rs
index e008b0cc357..4c46b614127 100644
--- a/library/alloc/tests/thin_box.rs
+++ b/library/alloc/tests/thin_box.rs
@@ -1,5 +1,4 @@
 use core::fmt::Debug;
-use core::mem::size_of;
 use std::boxed::ThinBox;
 
 #[test]
@@ -52,7 +51,7 @@ fn verify_aligned<T>(ptr: *const T) {
         ptr.is_aligned() && !ptr.is_null(),
         "misaligned ThinBox data; valid pointers to `{ty}` should be aligned to {align}: {ptr:p}",
         ty = core::any::type_name::<T>(),
-        align = core::mem::align_of::<T>(),
+        align = align_of::<T>(),
     );
 }
 
diff --git a/library/alloc/tests/vec.rs b/library/alloc/tests/vec.rs
index fe1db56414e..f430d979fa8 100644
--- a/library/alloc/tests/vec.rs
+++ b/library/alloc/tests/vec.rs
@@ -11,14 +11,14 @@ use std::borrow::Cow;
 use std::cell::Cell;
 use std::collections::TryReserveErrorKind::*;
 use std::fmt::Debug;
+use std::hint;
 use std::iter::InPlaceIterable;
-use std::mem::{size_of, swap};
+use std::mem::swap;
 use std::ops::Bound::*;
 use std::panic::{AssertUnwindSafe, catch_unwind};
 use std::rc::Rc;
 use std::sync::atomic::{AtomicU32, Ordering};
 use std::vec::{Drain, IntoIter};
-use std::{hint, mem};
 
 struct DropCounter<'a> {
     count: &'a mut u32,
@@ -1134,7 +1134,7 @@ fn test_into_iter_zst() {
     impl Drop for AlignedZstWithDrop {
         fn drop(&mut self) {
             let addr = self as *mut _ as usize;
-            assert!(hint::black_box(addr) % mem::align_of::<u64>() == 0);
+            assert!(hint::black_box(addr) % align_of::<u64>() == 0);
         }
     }