diff --git a/src/libcollections/binary_heap.rs b/src/libcollections/binary_heap.rs
index bedeab67420cc..3ca6973612633 100644
--- a/src/libcollections/binary_heap.rs
+++ b/src/libcollections/binary_heap.rs
@@ -214,11 +214,14 @@ impl<T: Ord> BinaryHeap<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(collections)]
+    /// #![feature(binary_heap_extras)]
     ///
     /// use std::collections::BinaryHeap;
     /// let heap = BinaryHeap::from_vec(vec![9, 1, 2, 7, 3, 2]);
     /// ```
+    #[unstable(feature = "binary_heap_extras",
+               reason = "needs to be audited",
+               issue = "28147")]
     pub fn from_vec(vec: Vec<T>) -> BinaryHeap<T> {
         let mut heap = BinaryHeap { data: vec };
         let mut n = heap.len() / 2;
@@ -235,7 +238,7 @@ impl<T: Ord> BinaryHeap<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(collections)]
+    /// #![feature(binary_heap_extras)]
     ///
     /// use std::collections::BinaryHeap;
     /// let heap = BinaryHeap::from_vec(vec![1, 2, 3, 4]);
@@ -341,7 +344,7 @@ impl<T: Ord> BinaryHeap<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(collections)]
+    /// #![feature(binary_heap_extras)]
     ///
     /// use std::collections::BinaryHeap;
     /// let mut heap = BinaryHeap::from_vec(vec![1, 3]);
@@ -388,7 +391,7 @@ impl<T: Ord> BinaryHeap<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(collections)]
+    /// #![feature(binary_heap_extras)]
     ///
     /// use std::collections::BinaryHeap;
     /// let mut heap = BinaryHeap::new();
@@ -400,6 +403,9 @@ impl<T: Ord> BinaryHeap<T> {
     /// assert_eq!(heap.len(), 2);
     /// assert_eq!(heap.peek(), Some(&3));
     /// ```
+    #[unstable(feature = "binary_heap_extras",
+               reason = "needs to be audited",
+               issue = "28147")]
     pub fn push_pop(&mut self, mut item: T) -> T {
         match self.data.get_mut(0) {
             None => return item,
@@ -421,7 +427,7 @@ impl<T: Ord> BinaryHeap<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(collections)]
+    /// #![feature(binary_heap_extras)]
     ///
     /// use std::collections::BinaryHeap;
     /// let mut heap = BinaryHeap::new();
@@ -431,6 +437,9 @@ impl<T: Ord> BinaryHeap<T> {
     /// assert_eq!(heap.len(), 1);
     /// assert_eq!(heap.peek(), Some(&3));
     /// ```
+    #[unstable(feature = "binary_heap_extras",
+               reason = "needs to be audited",
+               issue = "28147")]
     pub fn replace(&mut self, mut item: T) -> Option<T> {
         if !self.is_empty() {
             swap(&mut item, &mut self.data[0]);
@@ -448,7 +457,7 @@ impl<T: Ord> BinaryHeap<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(collections)]
+    /// #![feature(binary_heap_extras)]
     ///
     /// use std::collections::BinaryHeap;
     /// let heap = BinaryHeap::from_vec(vec![1, 2, 3, 4, 5, 6, 7]);
@@ -459,6 +468,9 @@ impl<T: Ord> BinaryHeap<T> {
     ///     println!("{}", x);
     /// }
     /// ```
+    #[unstable(feature = "binary_heap_extras",
+               reason = "needs to be audited",
+               issue = "28147")]
     pub fn into_vec(self) -> Vec<T> { self.data }
 
     /// Consumes the `BinaryHeap` and returns a vector in sorted
@@ -467,7 +479,7 @@ impl<T: Ord> BinaryHeap<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(collections)]
+    /// #![feature(binary_heap_extras)]
     ///
     /// use std::collections::BinaryHeap;
     ///
@@ -478,6 +490,9 @@ impl<T: Ord> BinaryHeap<T> {
     /// let vec = heap.into_sorted_vec();
     /// assert_eq!(vec, [1, 2, 3, 4, 5, 6, 7]);
     /// ```
+    #[unstable(feature = "binary_heap_extras",
+               reason = "needs to be audited",
+               issue = "28147")]
     pub fn into_sorted_vec(mut self) -> Vec<T> {
         let mut end = self.len();
         while end > 1 {
@@ -730,7 +745,7 @@ impl<T: Ord> IntoIterator for BinaryHeap<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(collections)]
+    /// #![feature(binary_heap_extras)]
     ///
     /// use std::collections::BinaryHeap;
     /// let heap = BinaryHeap::from_vec(vec![1, 2, 3, 4]);
diff --git a/src/libcollectionstest/lib.rs b/src/libcollectionstest/lib.rs
index 5748c105eed97..d84f5bdf10785 100644
--- a/src/libcollectionstest/lib.rs
+++ b/src/libcollectionstest/lib.rs
@@ -10,6 +10,7 @@
 
 #![feature(ascii)]
 #![feature(append)]
+#![feature(binary_heap_extras)]
 #![feature(box_syntax)]
 #![feature(btree_range)]
 #![feature(collections)]
diff --git a/src/test/run-pass/binary-heap-panic-safe.rs b/src/test/run-pass/binary-heap-panic-safe.rs
index 61a7fab130928..8bdac6808d089 100644
--- a/src/test/run-pass/binary-heap-panic-safe.rs
+++ b/src/test/run-pass/binary-heap-panic-safe.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(std_misc, collections, catch_panic, rand, sync_poison)]
+#![feature(std_misc, binary_heap_extras, catch_panic, rand, sync_poison)]
 
 use std::__rand::{thread_rng, Rng};
 use std::thread;
diff --git a/src/test/run-pass/while-let.rs b/src/test/run-pass/while-let.rs
index 5a2ecdd45dbe5..efccff75a49dd 100644
--- a/src/test/run-pass/while-let.rs
+++ b/src/test/run-pass/while-let.rs
@@ -9,7 +9,7 @@
 // except according to those terms.
 
 
-#![feature(collections)]
+#![feature(binary_heap_extras)]
 
 use std::collections::BinaryHeap;