Remove WeakRef and NonNullPtr impl for Weak<T>

ostd/src/sync/rcu/non_null/mod.rs

@@ -5,7 +5,6 @@
 
 mod either;
 
-use alloc::sync::Weak;
 use core::{marker::PhantomData, mem::ManuallyDrop, ops::Deref, ptr::NonNull};
 
 use crate::prelude::*;
@@ -202,59 +201,3 @@ unsafe impl<T: 'static> NonNullPtr for Arc<T> {
         NonNullPtr::into_raw(ManuallyDrop::into_inner(ptr_ref.inner))
     }
 }
-
-/// A type that represents `&'a Weak<T>`.
-#[derive(Debug)]
-pub struct WeakRef<'a, T> {
-    inner: ManuallyDrop<Weak<T>>,
-    _marker: PhantomData<&'a Weak<T>>,
-}
-
-impl<T> Deref for WeakRef<'_, T> {
-    type Target = Weak<T>;
-
-    fn deref(&self) -> &Self::Target {
-        &self.inner
-    }
-}
-
-unsafe impl<T: 'static> NonNullPtr for Weak<T> {
-    type Target = T;
-
-    type Ref<'a>
-        = WeakRef<'a, T>
-    where
-        Self: 'a;
-
-    // The alignment of `Weak<T>` is 1 instead of `align_of::<T>()`.
-    // This is because `Weak::new()` uses a dangling pointer that is _not_ aligned.
-    const ALIGN_BITS: u32 = 0;
-
-    fn into_raw(self) -> NonNull<Self::Target> {
-        let ptr = Weak::into_raw(self).cast_mut();
-
-        // SAFETY: The pointer representing an `Weak` can never be NULL.
-        unsafe { NonNull::new_unchecked(ptr) }
-    }
-
-    unsafe fn from_raw(ptr: NonNull<Self::Target>) -> Self {
-        let ptr = ptr.as_ptr().cast_const();
-
-        // SAFETY: The safety is upheld by the caller.
-        unsafe { Weak::from_raw(ptr) }
-    }
-
-    unsafe fn raw_as_ref<'a>(raw: NonNull<Self::Target>) -> Self::Ref<'a> {
-        // SAFETY: The safety is upheld by the caller.
-        unsafe {
-            WeakRef {
-                inner: ManuallyDrop::new(Weak::from_raw(raw.as_ptr())),
-                _marker: PhantomData,
-            }
-        }
-    }
-
-    fn ref_as_raw(ptr_ref: Self::Ref<'_>) -> NonNull<Self::Target> {
-        NonNullPtr::into_raw(ManuallyDrop::into_inner(ptr_ref.inner))
-    }
-}