Update for rust beta

Now, 'Copy' is subtrait of 'Clone'.

src/array.rs

@@ -29,7 +29,7 @@ pub type CFArrayEqualCallBack = *const u8;
 
 #[allow(dead_code)]
 #[repr(C)]
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 pub struct CFArrayCallBacks {
     version: CFIndex,
     retain: CFArrayRetainCallBack,

src/base.rs

@@ -37,7 +37,7 @@ pub type CFOptionFlags = u32;
 
 #[allow(dead_code)]
 #[repr(C)]
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 pub struct CFRange {
     location: CFIndex,
     length: CFIndex

src/dictionary.rs

@@ -25,7 +25,7 @@ pub type CFDictionaryRetainCallBack = *const u8;
 
 #[allow(dead_code)]
 #[repr(C)]
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 pub struct CFDictionaryKeyCallBacks {
     version: CFIndex,
     retain: CFDictionaryRetainCallBack,
@@ -37,7 +37,7 @@ pub struct CFDictionaryKeyCallBacks {
 
 #[allow(dead_code)]
 #[repr(C)]
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 pub struct CFDictionaryValueCallBacks {
     version: CFIndex,
     retain: CFDictionaryRetainCallBack,

src/set.rs

@@ -23,7 +23,7 @@ pub type CFSetHashCallBack = *const u8;
 
 #[allow(dead_code)]
 #[repr(C)]
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 pub struct CFSetCallBacks {
     version: CFIndex,
     retain: CFSetRetainCallBack,