Stabilize btree_range, closes rust-lang#27787

Author: aturon

src/libcollections/btree/map.rs

@@ -724,8 +724,6 @@ impl<K: Ord, V> BTreeMap<K, V> {
     /// Basic usage:
     ///
     /// ```
-    /// #![feature(btree_range, collections_bound)]
-    ///
     /// use std::collections::BTreeMap;
     /// use std::collections::Bound::Included;
     ///
@@ -738,9 +736,7 @@ impl<K: Ord, V> BTreeMap<K, V> {
     /// }
     /// assert_eq!(Some((&5, &"b")), map.range(4..).next());
     /// ```
-    #[unstable(feature = "btree_range",
-               reason = "matches collection reform specification, waiting for dust to settle",
-               issue = "27787")]
+    #[stable(feature = "btree_range", since = "1.17.0")]
     pub fn range<T: ?Sized, R>(&self, range: R) -> Range<K, V>
         where T: Ord, K: Borrow<T>, R: RangeArgument<T>
     {
@@ -768,8 +764,6 @@ impl<K: Ord, V> BTreeMap<K, V> {
     /// Basic usage:
     ///
     /// ```
-    /// #![feature(btree_range)]
-    ///
     /// use std::collections::BTreeMap;
     ///
     /// let mut map: BTreeMap<&str, i32> = ["Alice", "Bob", "Carol", "Cheryl"].iter()
@@ -782,9 +776,7 @@ impl<K: Ord, V> BTreeMap<K, V> {
     ///     println!("{} => {}", name, balance);
     /// }
     /// ```
-    #[unstable(feature = "btree_range",
-               reason = "matches collection reform specification, waiting for dust to settle",
-               issue = "27787")]
+    #[stable(feature = "btree_range", since = "1.17.0")]
     pub fn range_mut<T: ?Sized, R>(&mut self, range: R) -> RangeMut<K, V>
         where T: Ord, K: Borrow<T>, R: RangeArgument<T>
     {

src/libcollections/lib.rs

@@ -129,7 +129,7 @@ mod std {
 }
 
 /// An endpoint of a range of keys.
-#[unstable(feature = "collections_bound", issue = "27787")]
+#[stable(feature = "collections_bound", since = "1.17.0")]
 #[derive(Clone, Copy, Debug, Hash, PartialEq, Eq)]
 pub enum Bound<T> {
     /// An inclusive bound.