Manually dereference Id

See SSheldon/rust-objc#102

Author: madsmtm

examples/custom_class.rs

@@ -66,12 +66,12 @@ fn main() {
 
     obj.set_number(7);
     println!("Number: {}", unsafe {
-        let number: u32 = msg_send![obj, number];
+        let number: u32 = msg_send![&*obj, number];
         number
     });
 
     unsafe {
-        let _: () = msg_send![obj, setNumber:12u32];
+        let _: () = msg_send![&*obj, setNumber:12u32];
     }
     println!("Number: {}", obj.number());
 }

src/dictionary.rs

@@ -107,7 +107,7 @@ pub trait INSDictionary : INSObject {
 
     fn into_values_array(dict: Id<Self>) -> Id<NSArray<Self::Value, Self::Own>> {
         unsafe {
-            let vals = msg_send![dict, allValues];
+            let vals = msg_send![&*dict, allValues];
             Id::from_ptr(vals)
         }
     }

src/enumerator.rs

@@ -25,7 +25,7 @@ impl<'a, T> Iterator for NSEnumerator<'a, T> where T: INSObject {
 
     fn next(&mut self) -> Option<&'a T> {
         unsafe {
-            let obj: *mut T = msg_send![self.id, nextObject];
+            let obj: *mut T = msg_send![&*self.id, nextObject];
             if obj.is_null() { None } else { Some(&*obj) }
         }
     }