std: Second pass stabilization of default

This commit performs a second pass stabilization of the `std::default` module.
The module was already marked `#[stable]`, and the inheritance of `#[stable]`
was removed since this attribute was applied. This commit adds the `#[stable]`
attribute to the trait definition and one method name, along with all
implementations found in the standard distribution.

Author: alexcrichton

src/liballoc/arc.rs

@@ -316,7 +316,9 @@ impl<T: fmt::Show> fmt::Show for Arc<T> {
     }
 }
 
+#[stable]
 impl<T: Default + Sync + Send> Default for Arc<T> {
+    #[stable]
     fn default() -> Arc<T> { Arc::new(Default::default()) }
 }
 

src/liballoc/boxed.rs

@@ -44,11 +44,15 @@ pub static HEAP: () = ();
 #[unstable = "custom allocators will add an additional type parameter (with default)"]
 pub struct Box<T>(*mut T);
 
+#[stable]
 impl<T: Default> Default for Box<T> {
+    #[stable]
     fn default() -> Box<T> { box Default::default() }
 }
 
+#[stable]
 impl<T> Default for Box<[T]> {
+    #[stable]
     fn default() -> Box<[T]> { box [] }
 }
 

src/liballoc/rc.rs

@@ -447,6 +447,7 @@ impl<T: Default> Default for Rc<T> {
     /// let x: Rc<int> = Default::default();
     /// ```
     #[inline]
+    #[stable]
     fn default() -> Rc<T> {
         Rc::new(Default::default())
     }

src/libcollections/binary_heap.rs

@@ -172,8 +172,10 @@ pub struct BinaryHeap<T> {
     data: Vec<T>,
 }
 
+#[stable]
 impl<T: Ord> Default for BinaryHeap<T> {
     #[inline]
+    #[stable]
     fn default() -> BinaryHeap<T> { BinaryHeap::new() }
 }
 

src/libcollections/bit.rs

@@ -824,8 +824,10 @@ pub fn from_fn<F>(len: uint, mut f: F) -> Bitv where F: FnMut(uint) -> bool {
     bitv
 }
 
+#[stable]
 impl Default for Bitv {
     #[inline]
+    #[stable]
     fn default() -> Bitv { Bitv::new() }
 }
 

src/libcollections/btree/map.rs

@@ -836,7 +836,9 @@ impl<S: Writer, K: Hash<S>, V: Hash<S>> Hash<S> for BTreeMap<K, V> {
     }
 }
 
+#[stable]
 impl<K: Ord, V> Default for BTreeMap<K, V> {
+    #[stable]
     fn default() -> BTreeMap<K, V> {
         BTreeMap::new()
     }

src/libcollections/btree/set.rs

@@ -436,7 +436,9 @@ impl<T: Ord> Extend<T> for BTreeSet<T> {
     }
 }
 
+#[stable]
 impl<T: Ord> Default for BTreeSet<T> {
+    #[stable]
     fn default() -> BTreeSet<T> {
         BTreeSet::new()
     }

src/libcollections/dlist.rs

@@ -192,8 +192,10 @@ impl<T> DList<T> {
     }
 }
 
+#[stable]
 impl<T> Default for DList<T> {
     #[inline]
+    #[stable]
     fn default() -> DList<T> { DList::new() }
 }
 

src/libcollections/hash/sip.rs

@@ -204,8 +204,10 @@ impl Clone for SipState {
     }
 }
 
+#[stable]
 impl Default for SipState {
     #[inline]
+    #[stable]
     fn default() -> SipState {
         SipState::new()
     }

src/libcollections/ring_buf.rs

@@ -68,7 +68,9 @@ impl<T> Drop for RingBuf<T> {
     }
 }
 
+#[stable]
 impl<T> Default for RingBuf<T> {
+    #[stable]
     #[inline]
     fn default() -> RingBuf<T> { RingBuf::new() }
 }