Remove all unsafe_destructor

src/sdl2/audio.rs

@@ -400,7 +400,6 @@ impl<'a, CB: 'a> DerefMut for AudioDeviceLockGuard<'a, CB> {
     fn deref_mut(&mut self) -> &mut CB { &mut self.device.userdata.callback }
 }
 
-#[unsafe_destructor]
 impl<'a, CB> Drop for AudioDeviceLockGuard<'a, CB> {
     fn drop(&mut self) {
         unsafe { ll::SDL_UnlockAudioDevice(self.device.device_id.id()) }

src/sdl2/lib.rs

@@ -1,7 +1,7 @@
 #![crate_name = "sdl2"]
 #![crate_type = "lib"]
 
-#![feature(unsafe_destructor, optin_builtin_traits, std_misc, core)]
+#![feature(optin_builtin_traits, std_misc, core)]
 
 extern crate libc;
 #[macro_use]

src/sdl2/render.rs

@@ -862,7 +862,6 @@ pub struct Texture<'renderer> {
     _marker: PhantomData<&'renderer ()>
 }
 
-#[unsafe_destructor]
 impl<'renderer> Drop for Texture<'renderer> {
     fn drop(&mut self) {
         if self.owned {

src/sdl2/sdl.rs

@@ -105,7 +105,6 @@ pub struct Subsystem<'sdl> {
     _marker: PhantomData<&'sdl Sdl>
 }
 
-#[unsafe_destructor]
 impl<'sdl> Drop for Subsystem<'sdl> {
     fn drop(&mut self) {
         unsafe { ll::SDL_QuitSubSystem(self.flags.bits()); }

src/sdl2/timer.rs

@@ -54,7 +54,6 @@ impl<'a> Timer<'a> {
     }
 }
 
-#[unsafe_destructor]
 impl<'a> Drop for Timer<'a> {
     fn drop(&mut self) {
         let ret = unsafe { ll::SDL_RemoveTimer(self.raw) };