1 files changed, 22 insertions, 0 deletions
diff --git a/src/liballoc/boxed.rs b/src/liballoc/boxed.rs
index b5c6cdff119..65c66ebe768 100644
--- a/src/liballoc/boxed.rs
+++ b/src/liballoc/boxed.rs
@@ -136,6 +136,9 @@ pub struct IntermediateBox<T: ?Sized> {
     marker: marker::PhantomData<*mut T>,
 }
 
+#[unstable(feature = "placement_in",
+           reason = "placement box design is still being worked out.",
+           issue = "27779")]
 impl<T> Place<T> for IntermediateBox<T> {
     fn pointer(&mut self) -> *mut T {
         self.ptr as *mut T
@@ -170,12 +173,18 @@ fn make_place<T>() -> IntermediateBox<T> {
     }
 }
 
+#[unstable(feature = "placement_in",
+           reason = "placement box design is still being worked out.",
+           issue = "27779")]
 impl<T> BoxPlace<T> for IntermediateBox<T> {
     fn make_place() -> IntermediateBox<T> {
         make_place()
     }
 }
 
+#[unstable(feature = "placement_in",
+           reason = "placement box design is still being worked out.",
+           issue = "27779")]
 impl<T> InPlace<T> for IntermediateBox<T> {
     type Owner = Box<T>;
     unsafe fn finalize(self) -> Box<T> {
@@ -183,6 +192,7 @@ impl<T> InPlace<T> for IntermediateBox<T> {
     }
 }
 
+#[unstable(feature = "placement_new_protocol", issue = "27779")]
 impl<T> Boxed for Box<T> {
     type Data = T;
     type Place = IntermediateBox<T>;
@@ -191,6 +201,9 @@ impl<T> Boxed for Box<T> {
     }
 }
 
+#[unstable(feature = "placement_in",
+           reason = "placement box design is still being worked out.",
+           issue = "27779")]
 impl<T> Placer<T> for ExchangeHeapSingleton {
     type Place = IntermediateBox<T>;
 
@@ -199,6 +212,9 @@ impl<T> Placer<T> for ExchangeHeapSingleton {
     }
 }
 
+#[unstable(feature = "placement_in",
+           reason = "placement box design is still being worked out.",
+           issue = "27779")]
 impl<T: ?Sized> Drop for IntermediateBox<T> {
     fn drop(&mut self) {
         if self.size > 0 {
@@ -518,6 +534,7 @@ pub trait FnBox<A> {
     fn call_box(self: Box<Self>, args: A) -> Self::Output;
 }
 
+#[unstable(feature = "fnbox", reason = "Newly introduced", issue = "0")]
 impl<A,F> FnBox<A> for F
     where F: FnOnce<A>
 {
@@ -528,6 +545,7 @@ impl<A,F> FnBox<A> for F
     }
 }
 
+#[unstable(feature = "fnbox", reason = "Newly introduced", issue = "0")]
 impl<'a,A,R> FnOnce<A> for Box<FnBox<A,Output=R>+'a> {
     type Output = R;
 
@@ -536,6 +554,7 @@ impl<'a,A,R> FnOnce<A> for Box<FnBox<A,Output=R>+'a> {
     }
 }
 
+#[unstable(feature = "fnbox", reason = "Newly introduced", issue = "0")]
 impl<'a,A,R> FnOnce<A> for Box<FnBox<A,Output=R>+Send+'a> {
     type Output = R;
 
@@ -544,6 +563,7 @@ impl<'a,A,R> FnOnce<A> for Box<FnBox<A,Output=R>+Send+'a> {
     }
 }
 
+#[unstable(feature = "coerce_unsized", issue = "27732")]
 impl<T: ?Sized+Unsize<U>, U: ?Sized> CoerceUnsized<Box<U>> for Box<T> {}
 
 #[stable(feature = "box_slice_clone", since = "1.3.0")]
@@ -597,12 +617,14 @@ impl<T: Clone> Clone for Box<[T]> {
     }
 }
 
+#[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized> borrow::Borrow<T> for Box<T> {
     fn borrow(&self) -> &T {
         &**self
     }
 }
 
+#[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized> borrow::BorrowMut<T> for Box<T> {
     fn borrow_mut(&mut self) -> &mut T {
         &mut **self