Annotate raw pointer target types

cc rust-lang#46906
cc rust-lang#46914

src/librustc_data_structures/array_vec.rs

@@ -138,7 +138,7 @@ impl<A: Array> ArrayVec<A> {
             // Use the borrow in the IterMut to indicate borrowing behavior of the
             // whole Drain iterator (like &mut T).
             let range_slice = {
-                let arr = &mut self.values as &mut [ManuallyDrop<_>];
+                let arr = &mut self.values as &mut [ManuallyDrop<<A as Array>::Element>];
                 slice::from_raw_parts_mut(arr.as_mut_ptr().offset(start as isize),
                                           end - start)
             };
@@ -260,7 +260,8 @@ impl<'a, A: Array> Drop for Drain<'a, A> {
                 let start = source_array_vec.len();
                 let tail = self.tail_start;
                 {
-                    let arr = &mut source_array_vec.values as &mut [ManuallyDrop<_>];
+                    let arr =
+                        &mut source_array_vec.values as &mut [ManuallyDrop<<A as Array>::Element>];
                     let src = arr.as_ptr().offset(tail as isize);
                     let dst = arr.as_mut_ptr().offset(start as isize);
                     ptr::copy(src, dst, self.tail_len);

src/libstd/sys/windows/fs.rs

@@ -770,7 +770,7 @@ fn symlink_junction_inner(target: &Path, junction: &Path) -> io::Result<()> {
         let mut data = [0u8; c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
         let db = data.as_mut_ptr()
                     as *mut c::REPARSE_MOUNTPOINT_DATA_BUFFER;
-        let buf = &mut (*db).ReparseTarget as *mut _;
+        let buf = &mut (*db).ReparseTarget as *mut c::WCHAR;
         let mut i = 0;
         // FIXME: this conversion is very hacky
         let v = br"\??\";