Remove stage0 hacks

src/liballoc/arc.rs

@@ -127,7 +127,6 @@ const MAX_REFCOUNT: usize = (isize::MAX) as usize;
 /// }
 /// ```
 
-#[cfg_attr(stage0, unsafe_no_drop_flag)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct Arc<T: ?Sized> {
     ptr: Shared<ArcInner<T>>,
@@ -153,7 +152,6 @@ impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Arc<U>> for Arc<T> {}
 /// nodes behind strong `Arc<T>` pointers, and then storing the parent pointers
 /// as `Weak<T>` pointers.
 
-#[cfg_attr(stage0, unsafe_no_drop_flag)]
 #[stable(feature = "arc_weak", since = "1.4.0")]
 pub struct Weak<T: ?Sized> {
     ptr: Shared<ArcInner<T>>,

src/liballoc/lib.rs

@@ -88,7 +88,6 @@
 #![feature(staged_api)]
 #![feature(unboxed_closures)]
 #![feature(unique)]
-#![cfg_attr(stage0, feature(unsafe_no_drop_flag))]
 #![feature(unsize)]
 
 #![cfg_attr(not(test), feature(fused, fn_traits, placement_new_protocol))]

src/liballoc/raw_vec.rs

@@ -44,7 +44,6 @@ use core::cmp;
 /// `shrink_to_fit`, and `from_box` will actually set RawVec's private capacity
 /// field. This allows zero-sized types to not be special-cased by consumers of
 /// this type.
-#[cfg_attr(stage0, unsafe_no_drop_flag)]
 pub struct RawVec<T> {
     ptr: Unique<T>,
     cap: usize,

src/liballoc/rc.rs

@@ -252,7 +252,6 @@ struct RcBox<T: ?Sized> {
 /// that you have to call them as e.g. `Rc::get_mut(&value)` instead of
 /// `value.get_mut()`.  This avoids conflicts with methods of the inner
 /// type `T`.
-#[cfg_attr(stage0, unsafe_no_drop_flag)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct Rc<T: ?Sized> {
     ptr: Shared<RcBox<T>>,
@@ -873,7 +872,6 @@ impl<T> From<T> for Rc<T> {
 ///
 /// [rc]: struct.Rc.html
 /// [downgrade]: struct.Rc.html#method.downgrade
-#[cfg_attr(stage0, unsafe_no_drop_flag)]
 #[stable(feature = "rc_weak", since = "1.4.0")]
 pub struct Weak<T: ?Sized> {
     ptr: Shared<RcBox<T>>,