Reduce use of NonNull::new_unchecked in library/

3 files changed, 11 insertions, 10 deletions

diff --git a/library/alloc/src/raw_vec.rs b/library/alloc/src/raw_vec.rs
index 94e6924f41a..49f5f53f9b3 100644
--- a/library/alloc/src/raw_vec.rs
+++ b/library/alloc/src/raw_vec.rs
@@ -207,11 +207,7 @@ impl<T, A: Allocator> RawVec<T, A> {
             // Allocators currently return a `NonNull<[u8]>` whose length
             // matches the size requested. If that ever changes, the capacity
             // here should change to `ptr.len() / mem::size_of::<T>()`.
-            Self {
-                ptr: unsafe { Unique::new_unchecked(ptr.cast().as_ptr()) },
-                cap: unsafe { Cap(capacity) },
-                alloc,
-            }
+            Self { ptr: Unique::from(ptr.cast()), cap: unsafe { Cap(capacity) }, alloc }
         }
     }
 
@@ -239,6 +235,11 @@ impl<T, A: Allocator> RawVec<T, A> {
         self.ptr.as_ptr()
     }
 
+    #[inline]
+    pub fn non_null(&self) -> NonNull<T> {
+        NonNull::from(self.ptr)
+    }
+
     /// Gets the capacity of the allocation.
     ///
     /// This will always be `usize::MAX` if `T` is zero-sized.
@@ -398,7 +399,7 @@ impl<T, A: Allocator> RawVec<T, A> {
         // Allocators currently return a `NonNull<[u8]>` whose length matches
         // the size requested. If that ever changes, the capacity here should
         // change to `ptr.len() / mem::size_of::<T>()`.
-        self.ptr = unsafe { Unique::new_unchecked(ptr.cast().as_ptr()) };
+        self.ptr = Unique::from(ptr.cast());
         self.cap = unsafe { Cap(cap) };
     }
 
diff --git a/library/alloc/src/vec/into_iter.rs b/library/alloc/src/vec/into_iter.rs
index 654ce09afcd..7800560da94 100644
--- a/library/alloc/src/vec/into_iter.rs
+++ b/library/alloc/src/vec/into_iter.rs
@@ -136,7 +136,7 @@ impl<T, A: Allocator> IntoIter<T, A> {
         // struct and then overwriting &mut self.
         // this creates less assembly
         self.cap = 0;
-        self.buf = unsafe { NonNull::new_unchecked(RawVec::NEW.ptr()) };
+        self.buf = RawVec::NEW.non_null();
         self.ptr = self.buf;
         self.end = self.buf.as_ptr();
 
diff --git a/library/alloc/src/vec/mod.rs b/library/alloc/src/vec/mod.rs
index b3e5ecc9240..08e3cdedc66 100644
--- a/library/alloc/src/vec/mod.rs
+++ b/library/alloc/src/vec/mod.rs
@@ -2861,16 +2861,16 @@ impl<T, A: Allocator> IntoIterator for Vec<T, A> {
     #[inline]
     fn into_iter(self) -> Self::IntoIter {
         unsafe {
-            let mut me = ManuallyDrop::new(self);
+            let me = ManuallyDrop::new(self);
             let alloc = ManuallyDrop::new(ptr::read(me.allocator()));
-            let begin = me.as_mut_ptr();
+            let buf = me.buf.non_null();
+            let begin = buf.as_ptr();
             let end = if T::IS_ZST {
                 begin.wrapping_byte_add(me.len())
             } else {
                 begin.add(me.len()) as *const T
             };
             let cap = me.buf.capacity();
-            let buf = NonNull::new_unchecked(begin);
             IntoIter { buf, phantom: PhantomData, cap, alloc, ptr: buf, end }
         }
     }