Auto merge of rust-lang#124432 - zetanumbers:non_copy_into_raw_with_a…

…lloc, r=Nilstrieb

Relax `A: Clone` bound for `rc::Weak::into_raw_and_alloc`

Makes this method to behave the same way as [`Box::into_raw_with_allocator`](https://doc.rust-lang.org/1.77.2/alloc/boxed/struct.Box.html#method.into_raw_with_allocator) and [`Vec::into_raw_parts_with_alloc`](https://doc.rust-lang.org/1.77.2/alloc/vec/struct.Vec.html#method.into_raw_parts_with_alloc).

I have also noticed the inconsistent presence and naming, should probably be addressed in the future.

library/alloc/src/rc.rs

@@ -3029,13 +3029,10 @@ impl<T: ?Sized, A: Allocator> Weak<T, A> {
  /// [`as_ptr`]: Weak::as_ptr
  #[inline]
  #[unstable(feature = "allocator_api", issue = "32838")]
- pub fn into_raw_and_alloc(self) -> (*const T, A)
- where
- A: Clone,
- {
- let result = self.as_ptr();
- let alloc = self.alloc.clone();
- mem::forget(self);
+ pub fn into_raw_and_alloc(self) -> (*const T, A) {
+ let rc = mem::ManuallyDrop::new(self);
+ let result = rc.as_ptr();
+ let alloc = unsafe { ptr::read(&rc.alloc) };
  (result, alloc)
  }