Refactor

Author: EFanZh

library/alloc/src/raw_rc.rs

@@ -1134,13 +1134,10 @@ impl<T, A> RawRc<[T], A> {
         {
             fn drop(&mut self) {
                 unsafe {
-                    let length = self.tail.sub_ptr(self.uninit_rc.uninit_rc.as_ptr().cast());
+                    let head = self.uninit_rc.uninit_rc.as_ptr().cast();
+                    let length = self.tail.sub_ptr(head);
 
-                    NonNull::<[T]>::slice_from_raw_parts(
-                        self.uninit_rc.uninit_rc.as_ptr().cast(),
-                        length,
-                    )
-                    .drop_in_place();
+                    NonNull::<[T]>::slice_from_raw_parts(head, length).drop_in_place();
                 }
             }
         }
@@ -1360,7 +1357,7 @@ where
         }
 
         #[cfg(target_pointer_width = "16")]
-        let selected_impl: unsafe fn() -> Self = const {
+        let selected_impl: fn() -> Self = const {
             select_impl![
                 0x0000, // (1 << 0) - 1
                 0x0001, // (1 << 1) - 1
@@ -1380,7 +1377,7 @@ where
         };
 
         #[cfg(target_pointer_width = "32")]
-        let selected_impl: unsafe fn() -> Self = const {
+        let selected_impl: fn() -> Self = const {
             select_impl![
                 0x00000000, // (1 << 0) - 1
                 0x00000001, // (1 << 1) - 1
@@ -1415,7 +1412,7 @@ where
         };
 
         #[cfg(target_pointer_width = "64")]
-        let selected_impl: unsafe fn() -> Self = const {
+        let selected_impl: fn() -> Self = const {
             select_impl![
                 0x0000000000000000, // (1 << 0) - 1
                 0x0000000000000001, // (1 << 1) - 1
@@ -1480,7 +1477,7 @@ where
             ]
         };
 
-        unsafe { selected_impl() }
+        selected_impl()
     }
 }