Auto merge of #28689 - Manishearth:rollup, r=Manishearth

- Successful merges: #28664, #28673, #28681, #28682, #28688
- Failed merges: 

4 files changed, 2 insertions, 26 deletions

diff --git a/src/libcollections/enum_set.rs b/src/libcollections/enum_set.rs
index 7e7e8ba2356..32cd4193d88 100644
--- a/src/libcollections/enum_set.rs
+++ b/src/libcollections/enum_set.rs
@@ -49,16 +49,7 @@ impl<E> Clone for EnumSet<E> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<E:CLike + fmt::Debug> fmt::Debug for EnumSet<E> {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        try!(write!(fmt, "{{"));
-        let mut first = true;
-        for e in self {
-            if !first {
-                try!(write!(fmt, ", "));
-            }
-            try!(write!(fmt, "{:?}", e));
-            first = false;
-        }
-        write!(fmt, "}}")
+        fmt.debug_set().entries(self).finish()
     }
 }
 
diff --git a/src/libcollections/str.rs b/src/libcollections/str.rs
index a3d38bdd1b3..124fe3fab56 100644
--- a/src/libcollections/str.rs
+++ b/src/libcollections/str.rs
@@ -506,8 +506,6 @@ impl str {
     ///
     /// # Examples
     /// ```
-    /// #![feature(str_split_at)]
-    ///
     /// let s = "Löwe 老虎 Léopard";
     /// let first_space = s.find(' ').unwrap_or(s.len());
     /// let (a, b) = s.split_at(first_space);
diff --git a/src/libcollections/vec.rs b/src/libcollections/vec.rs
index a145393e0e3..d645de028ce 100644
--- a/src/libcollections/vec.rs
+++ b/src/libcollections/vec.rs
@@ -753,8 +753,6 @@ impl<T> Vec<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(split_off)]
-    ///
     /// let mut vec = vec![1,2,3];
     /// let vec2 = vec.split_off(1);
     /// assert_eq!(vec, [1]);
diff --git a/src/libcollections/vec_deque.rs b/src/libcollections/vec_deque.rs
index 4ee9787c9ec..f7efe9a38df 100644
--- a/src/libcollections/vec_deque.rs
+++ b/src/libcollections/vec_deque.rs
@@ -1319,8 +1319,6 @@ impl<T> VecDeque<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(split_off)]
-    ///
     /// use std::collections::VecDeque;
     ///
     /// let mut buf: VecDeque<_> = vec![1,2,3].into_iter().collect();
@@ -1406,8 +1404,6 @@ impl<T> VecDeque<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(vec_deque_retain)]
-    ///
     /// use std::collections::VecDeque;
     ///
     /// let mut buf = VecDeque::new();
@@ -1787,14 +1783,7 @@ impl<'a, T: 'a + Copy> Extend<&'a T> for VecDeque<T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: fmt::Debug> fmt::Debug for VecDeque<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        try!(write!(f, "["));
-
-        for (i, e) in self.iter().enumerate() {
-            if i != 0 { try!(write!(f, ", ")); }
-            try!(write!(f, "{:?}", *e));
-        }
-
-        write!(f, "]")
+        f.debug_list().entries(self).finish()
     }
 }