Stabilize library features for 1.18.0

Closes #38863
Closes #38980
Closes #38903
Closes #36648

12 files changed, 27 insertions, 77 deletions

diff --git a/src/doc/unstable-book/src/SUMMARY.md b/src/doc/unstable-book/src/SUMMARY.md
index 39f80059148..f3fa49f4ef9 100644
--- a/src/doc/unstable-book/src/SUMMARY.md
+++ b/src/doc/unstable-book/src/SUMMARY.md
@@ -104,7 +104,6 @@
     - [alloc](library-features/alloc.md)
     - [as_c_str](library-features/as-c-str.md)
     - [ascii_ctype](library-features/ascii-ctype.md)
-    - [binary_heap_peek_mut_pop](library-features/binary-heap-peek-mut-pop.md)
     - [box_heap](library-features/box-heap.md)
     - [c_void_variant](library-features/c-void-variant.md)
     - [char_escape_debug](library-features/char-escape-debug.md)
@@ -175,17 +174,14 @@
     - [panic_abort](library-features/panic-abort.md)
     - [panic_unwind](library-features/panic-unwind.md)
     - [pattern](library-features/pattern.md)
-    - [peek](library-features/peek.md)
     - [placement_in](library-features/placement-in.md)
     - [placement_new_protocol](library-features/placement-new-protocol.md)
     - [print_internals](library-features/print-internals.md)
     - [proc_macro_internals](library-features/proc-macro-internals.md)
-    - [process_try_wait](library-features/process-try-wait.md)
     - [question_mark_carrier](library-features/question-mark-carrier.md)
     - [rand](library-features/rand.md)
     - [range_contains](library-features/range-contains.md)
     - [raw](library-features/raw.md)
-    - [retain_hash_collection](library-features/retain-hash-collection.md)
     - [reverse_cmp_key](library-features/reverse-cmp-key.md)
     - [rt](library-features/rt.md)
     - [rustc_private](library-features/rustc-private.md)
diff --git a/src/doc/unstable-book/src/library-features/binary-heap-peek-mut-pop.md b/src/doc/unstable-book/src/library-features/binary-heap-peek-mut-pop.md
deleted file mode 100644
index f3863ab2a2a..00000000000
--- a/src/doc/unstable-book/src/library-features/binary-heap-peek-mut-pop.md
+++ /dev/null
@@ -1,7 +0,0 @@
-# `binary_heap_peek_mut_pop`
-
-The tracking issue for this feature is: [#38863]
-
-[#38863]: https://github.com/rust-lang/rust/issues/38863
-
-------------------------
diff --git a/src/doc/unstable-book/src/library-features/peek.md b/src/doc/unstable-book/src/library-features/peek.md
deleted file mode 100644
index c42b4e995ec..00000000000
--- a/src/doc/unstable-book/src/library-features/peek.md
+++ /dev/null
@@ -1,7 +0,0 @@
-# `peek`
-
-The tracking issue for this feature is: [#38980]
-
-[#38980]: https://github.com/rust-lang/rust/issues/38980
-
-------------------------
diff --git a/src/doc/unstable-book/src/library-features/process-try-wait.md b/src/doc/unstable-book/src/library-features/process-try-wait.md
deleted file mode 100644
index 3593b642349..00000000000
--- a/src/doc/unstable-book/src/library-features/process-try-wait.md
+++ /dev/null
@@ -1,7 +0,0 @@
-# `process_try_wait`
-
-The tracking issue for this feature is: [#38903]
-
-[#38903]: https://github.com/rust-lang/rust/issues/38903
-
-------------------------
diff --git a/src/doc/unstable-book/src/library-features/retain-hash-collection.md b/src/doc/unstable-book/src/library-features/retain-hash-collection.md
deleted file mode 100644
index c9ba5acf020..00000000000
--- a/src/doc/unstable-book/src/library-features/retain-hash-collection.md
+++ /dev/null
@@ -1,7 +0,0 @@
-# `retain_hash_collection`
-
-The tracking issue for this feature is: [#36648]
-
-[#36648]: https://github.com/rust-lang/rust/issues/36648
-
-------------------------
diff --git a/src/libcollections/binary_heap.rs b/src/libcollections/binary_heap.rs
index 7d972403f65..4e9dea09f79 100644
--- a/src/libcollections/binary_heap.rs
+++ b/src/libcollections/binary_heap.rs
@@ -268,7 +268,7 @@ impl<'a, T: Ord> DerefMut for PeekMut<'a, T> {
 
 impl<'a, T: Ord> PeekMut<'a, T> {
     /// Removes the peeked value from the heap and returns it.
-    #[unstable(feature = "binary_heap_peek_mut_pop", issue = "38863")]
+    #[stable(feature = "binary_heap_peek_mut_pop", since = "1.18.0")]
     pub fn pop(mut this: PeekMut<'a, T>) -> T {
         let value = this.heap.pop().unwrap();
         this.sift = false;
diff --git a/src/libcollections/tests/lib.rs b/src/libcollections/tests/lib.rs
index eae3bf3915f..cda8c6d5998 100644
--- a/src/libcollections/tests/lib.rs
+++ b/src/libcollections/tests/lib.rs
@@ -10,7 +10,6 @@
 
 #![deny(warnings)]
 
-#![feature(binary_heap_peek_mut_pop)]
 #![feature(box_syntax)]
 #![feature(inclusive_range_syntax)]
 #![feature(collection_placement)]
diff --git a/src/libstd/collections/hash/map.rs b/src/libstd/collections/hash/map.rs
index 51d127f8ba7..8c4cbb66b45 100644
--- a/src/libstd/collections/hash/map.rs
+++ b/src/libstd/collections/hash/map.rs
@@ -1231,14 +1231,13 @@ impl<K, V, S> HashMap<K, V, S>
     /// # Examples
     ///
     /// ```
-    /// #![feature(retain_hash_collection)]
     /// use std::collections::HashMap;
     ///
     /// let mut map: HashMap<isize, isize> = (0..8).map(|x|(x, x*10)).collect();
     /// map.retain(|&k, _| k % 2 == 0);
     /// assert_eq!(map.len(), 4);
     /// ```
-    #[unstable(feature = "retain_hash_collection", issue = "36648")]
+    #[stable(feature = "retain_hash_collection", since = "1.18.0")]
     pub fn retain<F>(&mut self, mut f: F)
         where F: FnMut(&K, &mut V) -> bool
     {
diff --git a/src/libstd/collections/hash/set.rs b/src/libstd/collections/hash/set.rs
index 7215e1bde85..d80df5f18b6 100644
--- a/src/libstd/collections/hash/set.rs
+++ b/src/libstd/collections/hash/set.rs
@@ -116,8 +116,6 @@ use super::map::{self, HashMap, Keys, RandomState};
 /// [`HashMap`]: struct.HashMap.html
 /// [`PartialEq`]: ../../std/cmp/trait.PartialEq.html
 /// [`RefCell`]: ../../std/cell/struct.RefCell.html
-
-
 #[derive(Clone)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct HashSet<T, S = RandomState> {
@@ -658,7 +656,6 @@ impl<T, S> HashSet<T, S>
     /// # Examples
     ///
     /// ```
-    /// #![feature(retain_hash_collection)]
     /// use std::collections::HashSet;
     ///
     /// let xs = [1,2,3,4,5,6];
@@ -666,7 +663,7 @@ impl<T, S> HashSet<T, S>
     /// set.retain(|&k| k % 2 == 0);
     /// assert_eq!(set.len(), 3);
     /// ```
-    #[unstable(feature = "retain_hash_collection", issue = "36648")]
+    #[stable(feature = "retain_hash_collection", since = "1.18.0")]
     pub fn retain<F>(&mut self, mut f: F)
         where F: FnMut(&T) -> bool
     {
@@ -1041,9 +1038,7 @@ impl<'a, K> FusedIterator for Iter<'a, K> {}
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, K: fmt::Debug> fmt::Debug for Iter<'a, K> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.debug_list()
-            .entries(self.clone())
-            .finish()
+        f.debug_list().entries(self.clone()).finish()
     }
 }
 
@@ -1070,10 +1065,11 @@ impl<K> FusedIterator for IntoIter<K> {}
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl<K: fmt::Debug> fmt::Debug for IntoIter<K> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let entries_iter = self.iter.inner.iter().map(|(k, _)| k);
-        f.debug_list()
-            .entries(entries_iter)
-            .finish()
+        let entries_iter = self.iter
+            .inner
+            .iter()
+            .map(|(k, _)| k);
+        f.debug_list().entries(entries_iter).finish()
     }
 }
 
@@ -1100,10 +1096,11 @@ impl<'a, K> FusedIterator for Drain<'a, K> {}
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, K: fmt::Debug> fmt::Debug for Drain<'a, K> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let entries_iter = self.iter.inner.iter().map(|(k, _)| k);
-        f.debug_list()
-            .entries(entries_iter)
-            .finish()
+        let entries_iter = self.iter
+            .inner
+            .iter()
+            .map(|(k, _)| k);
+        f.debug_list().entries(entries_iter).finish()
     }
 }
 
@@ -1143,12 +1140,10 @@ impl<'a, T, S> Iterator for Intersection<'a, T, S>
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, T, S> fmt::Debug for Intersection<'a, T, S>
     where T: fmt::Debug + Eq + Hash,
-          S: BuildHasher,
+          S: BuildHasher
 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.debug_list()
-            .entries(self.clone())
-            .finish()
+        f.debug_list().entries(self.clone()).finish()
     }
 }
 
@@ -1202,12 +1197,10 @@ impl<'a, T, S> FusedIterator for Difference<'a, T, S>
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, T, S> fmt::Debug for Difference<'a, T, S>
     where T: fmt::Debug + Eq + Hash,
-          S: BuildHasher,
+          S: BuildHasher
 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.debug_list()
-            .entries(self.clone())
-            .finish()
+        f.debug_list().entries(self.clone()).finish()
     }
 }
 
@@ -1243,12 +1236,10 @@ impl<'a, T, S> FusedIterator for SymmetricDifference<'a, T, S>
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, T, S> fmt::Debug for SymmetricDifference<'a, T, S>
     where T: fmt::Debug + Eq + Hash,
-          S: BuildHasher,
+          S: BuildHasher
 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.debug_list()
-            .entries(self.clone())
-            .finish()
+        f.debug_list().entries(self.clone()).finish()
     }
 }
 
@@ -1269,12 +1260,10 @@ impl<'a, T, S> FusedIterator for Union<'a, T, S>
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl<'a, T, S> fmt::Debug for Union<'a, T, S>
     where T: fmt::Debug + Eq + Hash,
-          S: BuildHasher,
+          S: BuildHasher
 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.debug_list()
-            .entries(self.clone())
-            .finish()
+        f.debug_list().entries(self.clone()).finish()
     }
 }
 
@@ -1698,7 +1687,7 @@ mod test_set {
 
     #[test]
     fn test_retain() {
-        let xs = [1,2,3,4,5,6];
+        let xs = [1, 2, 3, 4, 5, 6];
         let mut set: HashSet<isize> = xs.iter().cloned().collect();
         set.retain(|&k| k % 2 == 0);
         assert_eq!(set.len(), 3);
diff --git a/src/libstd/net/tcp.rs b/src/libstd/net/tcp.rs
index 34229f80769..c1493c9c6f4 100644
--- a/src/libstd/net/tcp.rs
+++ b/src/libstd/net/tcp.rs
@@ -343,7 +343,6 @@ impl TcpStream {
     /// # Examples
     ///
     /// ```no_run
-    /// #![feature(peek)]
     /// use std::net::TcpStream;
     ///
     /// let stream = TcpStream::connect("127.0.0.1:8000")
@@ -351,7 +350,7 @@ impl TcpStream {
     /// let mut buf = [0; 10];
     /// let len = stream.peek(&mut buf).expect("peek failed");
     /// ```
-    #[unstable(feature = "peek", issue = "38980")]
+    #[stable(feature = "peek", since = "1.18.0")]
     pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
         self.0.peek(buf)
     }
diff --git a/src/libstd/net/udp.rs b/src/libstd/net/udp.rs
index cdf04f7f1a4..80151dc2b44 100644
--- a/src/libstd/net/udp.rs
+++ b/src/libstd/net/udp.rs
@@ -112,7 +112,6 @@ impl UdpSocket {
     /// # Examples
     ///
     /// ```no_run
-    /// #![feature(peek)]
     /// use std::net::UdpSocket;
     ///
     /// let socket = UdpSocket::bind("127.0.0.1:34254").expect("couldn't bind to address");
@@ -120,7 +119,7 @@ impl UdpSocket {
     /// let (number_of_bytes, src_addr) = socket.peek_from(&mut buf)
     ///                                         .expect("Didn't receive data");
     /// ```
-    #[unstable(feature = "peek", issue = "38980")]
+    #[stable(feature = "peek", since = "1.18.0")]
     pub fn peek_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
         self.0.peek_from(buf)
     }
@@ -638,7 +637,6 @@ impl UdpSocket {
     /// # Examples
     ///
     /// ```no_run
-    /// #![feature(peek)]
     /// use std::net::UdpSocket;
     ///
     /// let socket = UdpSocket::bind("127.0.0.1:34254").expect("couldn't bind to address");
@@ -649,7 +647,7 @@ impl UdpSocket {
     ///     Err(e) => println!("peek function failed: {:?}", e),
     /// }
     /// ```
-    #[unstable(feature = "peek", issue = "38980")]
+    #[stable(feature = "peek", since = "1.18.0")]
     pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
         self.0.peek(buf)
     }
diff --git a/src/libstd/process.rs b/src/libstd/process.rs
index 3896fc20a2d..a05dfb7bffe 100644
--- a/src/libstd/process.rs
+++ b/src/libstd/process.rs
@@ -905,8 +905,6 @@ impl Child {
     /// Basic usage:
     ///
     /// ```no_run
-    /// #![feature(process_try_wait)]
-    ///
     /// use std::process::Command;
     ///
     /// let mut child = Command::new("ls").spawn().unwrap();
@@ -921,7 +919,7 @@ impl Child {
     ///     Err(e) => println!("error attempting to wait: {}", e),
     /// }
     /// ```
-    #[unstable(feature = "process_try_wait", issue = "38903")]
+    #[stable(feature = "process_try_wait", since = "1.18.0")]
     pub fn try_wait(&mut self) -> io::Result<Option<ExitStatus>> {
         Ok(self.handle.try_wait()?.map(ExitStatus))
     }