Make reborrow fixes easier to read

Author: madsmtm

objc2-foundation/src/array.rs

@@ -272,14 +272,16 @@ impl<T: Message, O: Ownership> NSMutableArray<T, O> {
         obj
     }
 
+    fn remove_last(&mut self) {
+        unsafe { msg_send![self, removeLastObject] }
+    }
+
     #[doc(alias = "removeLastObject")]
     pub fn pop(&mut self) -> Option<Id<T, O>> {
         self.last()
             .map(|obj| unsafe { Id::retain(obj as *const T as *mut T).unwrap_unchecked() })
             .map(|obj| {
-                unsafe {
-                    let _: () = msg_send![self, removeLastObject];
-                }
+                self.remove_last();
                 obj
             })
     }

objc2-foundation/src/data.rs

@@ -154,10 +154,14 @@ impl NSMutableData {
 
 /// Mutation methods
 impl NSMutableData {
+    // Helps with reborrowing issue
+    fn raw_bytes_mut(&mut self) -> *mut c_void {
+        unsafe { msg_send![self, mutableBytes] }
+    }
+
     #[doc(alias = "mutableBytes")]
     pub fn bytes_mut(&mut self) -> &mut [u8] {
-        let this = &mut *self; // Reborrow
-        let ptr: *mut c_void = unsafe { msg_send![this, mutableBytes] };
+        let ptr = self.raw_bytes_mut();
         // The bytes pointer may be null for length zero
         if ptr.is_null() {
             &mut []