Rollup merge of #86785 - lf-:dead-code, r=Mark-Simulacrum

proc_macro/bridge: Remove dead code Slice type See #85390 (comment)

Author: JohnTitor

library/proc_macro/src/bridge/buffer.rs

@@ -5,35 +5,6 @@ use std::mem;
 use std::ops::{Deref, DerefMut};
 use std::slice;
 
-#[repr(C)]
-struct Slice<'a, T> {
- data: &'a [T; 0],
- len: usize,
-}
-
-unsafe impl<'a, T: Sync> Sync for Slice<'a, T> {}
-unsafe impl<'a, T: Sync> Send for Slice<'a, T> {}
-
-impl<T> Copy for Slice<'a, T> {}
-impl<T> Clone for Slice<'a, T> {
- fn clone(&self) -> Self {
- *self
- }
-}
-
-impl<T> From<&'a [T]> for Slice<'a, T> {
- fn from(xs: &'a [T]) -> Self {
- Slice { data: unsafe { &*(xs.as_ptr() as *const [T; 0]) }, len: xs.len() }
- }
-}
-
-impl<T> Deref for Slice<'a, T> {
- type Target = [T];
- fn deref(&self) -> &[T] {
- unsafe { slice::from_raw_parts(self.data.as_ptr(), self.len) }
- }
-}
-
 #[repr(C)]
 pub struct Buffer<T: Copy> {
  data: *mut T,