Auto merge of #38369 - aturon:stab-1.15, r=alexcrichton

Library stabilizations/deprecations for 1.15 release

Stabilized:

- `std::iter::Iterator::{min_by, max_by}`
- `std::os::*::fs::FileExt`
- `std::sync::atomic::Atomic*::{get_mut, into_inner}`
- `std::vec::IntoIter::{as_slice, as_mut_slice}`
- `std::sync::mpsc::Receiver::try_iter`
- `std::os::unix::process::CommandExt::before_exec`
- `std::rc::Rc::{strong_count, weak_count}`
- `std::sync::Arc::{strong_count, weak_count}`
- `std::char::{encode_utf8, encode_utf16}`
- `std::cell::Ref::clone`
- `std::io::Take::into_inner`

Deprecated:

- `std::rc::Rc::{would_unwrap, is_unique}`
- `std::cell::RefCell::borrow_state`

Closes #23755
Closes #27733
Closes #27746
Closes #27784
Closes #28356
Closes #31398
Closes #34931
Closes #35601
Closes #35603
Closes #35918
Closes #36105

src/liballoc/arc.rs

@@ -392,8 +392,6 @@ impl<T: ?Sized> Arc<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(arc_counts)]
-    ///
     /// use std::sync::Arc;
     ///
     /// let five = Arc::new(5);
@@ -404,8 +402,7 @@ impl<T: ?Sized> Arc<T> {
     /// assert_eq!(1, Arc::weak_count(&five));
     /// ```
     #[inline]
-    #[unstable(feature = "arc_counts", reason = "not clearly useful, and racy",
-               issue = "28356")]
+    #[stable(feature = "arc_counts", since = "1.15.0")]
     pub fn weak_count(this: &Self) -> usize {
         this.inner().weak.load(SeqCst) - 1
     }
@@ -421,8 +418,6 @@ impl<T: ?Sized> Arc<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(arc_counts)]
-    ///
     /// use std::sync::Arc;
     ///
     /// let five = Arc::new(5);
@@ -433,8 +428,7 @@ impl<T: ?Sized> Arc<T> {
     /// assert_eq!(2, Arc::strong_count(&five));
     /// ```
     #[inline]
-    #[unstable(feature = "arc_counts", reason = "not clearly useful, and racy",
-               issue = "28356")]
+    #[stable(feature = "arc_counts", since = "1.15.0")]
     pub fn strong_count(this: &Self) -> usize {
         this.inner().strong.load(SeqCst)
     }

src/liballoc/rc.rs

@@ -320,7 +320,7 @@ impl<T> Rc<T> {
     #[inline]
     #[stable(feature = "rc_unique", since = "1.4.0")]
     pub fn try_unwrap(this: Self) -> Result<T, Self> {
-        if Rc::would_unwrap(&this) {
+        if Rc::strong_count(&this) == 1 {
             unsafe {
                 let val = ptr::read(&*this); // copy the contained object
 
@@ -343,26 +343,10 @@ impl<T> Rc<T> {
     ///
     /// [try_unwrap]: struct.Rc.html#method.try_unwrap
     /// [`Ok`]: ../../std/result/enum.Result.html#variant.Ok
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// #![feature(rc_would_unwrap)]
-    ///
-    /// use std::rc::Rc;
-    ///
-    /// let x = Rc::new(3);
-    /// assert!(Rc::would_unwrap(&x));
-    /// assert_eq!(Rc::try_unwrap(x), Ok(3));
-    ///
-    /// let x = Rc::new(4);
-    /// let _y = x.clone();
-    /// assert!(!Rc::would_unwrap(&x));
-    /// assert_eq!(*Rc::try_unwrap(x).unwrap_err(), 4);
-    /// ```
     #[unstable(feature = "rc_would_unwrap",
                reason = "just added for niche usecase",
                issue = "28356")]
+    #[rustc_deprecated(since = "1.15.0", reason = "too niche; use `strong_count` instead")]
     pub fn would_unwrap(this: &Self) -> bool {
         Rc::strong_count(&this) == 1
     }
@@ -482,8 +466,6 @@ impl<T: ?Sized> Rc<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(rc_counts)]
-    ///
     /// use std::rc::Rc;
     ///
     /// let five = Rc::new(5);
@@ -492,8 +474,7 @@ impl<T: ?Sized> Rc<T> {
     /// assert_eq!(1, Rc::weak_count(&five));
     /// ```
     #[inline]
-    #[unstable(feature = "rc_counts", reason = "not clearly useful",
-               issue = "28356")]
+    #[stable(feature = "rc_counts", since = "1.15.0")]
     pub fn weak_count(this: &Self) -> usize {
         this.weak() - 1
     }
@@ -503,8 +484,6 @@ impl<T: ?Sized> Rc<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(rc_counts)]
-    ///
     /// use std::rc::Rc;
     ///
     /// let five = Rc::new(5);
@@ -513,8 +492,7 @@ impl<T: ?Sized> Rc<T> {
     /// assert_eq!(2, Rc::strong_count(&five));
     /// ```
     #[inline]
-    #[unstable(feature = "rc_counts", reason = "not clearly useful",
-               issue = "28356")]
+    #[stable(feature = "rc_counts", since = "1.15.0")]
     pub fn strong_count(this: &Self) -> usize {
         this.strong()
     }
@@ -523,21 +501,11 @@ impl<T: ?Sized> Rc<T> {
     /// this inner value.
     ///
     /// [weak]: struct.Weak.html
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// #![feature(rc_counts)]
-    ///
-    /// use std::rc::Rc;
-    ///
-    /// let five = Rc::new(5);
-    ///
-    /// assert!(Rc::is_unique(&five));
-    /// ```
     #[inline]
-    #[unstable(feature = "rc_counts", reason = "uniqueness has unclear meaning",
+    #[unstable(feature = "is_unique", reason = "uniqueness has unclear meaning",
                issue = "28356")]
+    #[rustc_deprecated(since = "1.15.0",
+                       reason = "too niche; use `strong_count` and `weak_count` instead")]
     pub fn is_unique(this: &Self) -> bool {
         Rc::weak_count(this) == 0 && Rc::strong_count(this) == 1
     }

src/libcollections/vec.rs

@@ -1902,14 +1902,13 @@ impl<T> IntoIter<T> {
     /// # Examples
     ///
     /// ```
-    /// # #![feature(vec_into_iter_as_slice)]
     /// let vec = vec!['a', 'b', 'c'];
     /// let mut into_iter = vec.into_iter();
     /// assert_eq!(into_iter.as_slice(), &['a', 'b', 'c']);
     /// let _ = into_iter.next().unwrap();
     /// assert_eq!(into_iter.as_slice(), &['b', 'c']);
     /// ```
-    #[unstable(feature = "vec_into_iter_as_slice", issue = "35601")]
+    #[stable(feature = "vec_into_iter_as_slice", since = "1.15.0")]
     pub fn as_slice(&self) -> &[T] {
         unsafe {
             slice::from_raw_parts(self.ptr, self.len())
@@ -1921,7 +1920,6 @@ impl<T> IntoIter<T> {
     /// # Examples
     ///
     /// ```
-    /// # #![feature(vec_into_iter_as_slice)]
     /// let vec = vec!['a', 'b', 'c'];
     /// let mut into_iter = vec.into_iter();
     /// assert_eq!(into_iter.as_slice(), &['a', 'b', 'c']);
@@ -1930,7 +1928,7 @@ impl<T> IntoIter<T> {
     /// assert_eq!(into_iter.next().unwrap(), 'b');
     /// assert_eq!(into_iter.next().unwrap(), 'z');
     /// ```
-    #[unstable(feature = "vec_into_iter_as_slice", issue = "35601")]
+    #[stable(feature = "vec_into_iter_as_slice", since = "1.15.0")]
     pub fn as_mut_slice(&self) -> &mut [T] {
         unsafe {
             slice::from_raw_parts_mut(self.ptr as *mut T, self.len())

src/libcollectionstest/lib.rs

@@ -29,7 +29,6 @@
 #![feature(test)]
 #![feature(unboxed_closures)]
 #![feature(unicode)]
-#![feature(vec_into_iter_as_slice)]
 
 extern crate collections;
 extern crate test;

src/libcore/cell.rs

@@ -393,6 +393,8 @@ pub struct RefCell<T: ?Sized> {
 /// An enumeration of values returned from the `state` method on a `RefCell<T>`.
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
 #[unstable(feature = "borrow_state", issue = "27733")]
+#[rustc_deprecated(since = "1.15.0", reason = "use `try_borrow` instead")]
+#[allow(deprecated)]
 pub enum BorrowState {
     /// The cell is currently being read, there is at least one active `borrow`.
     Reading,
@@ -511,6 +513,8 @@ impl<T: ?Sized> RefCell<T> {
     /// }
     /// ```
     #[unstable(feature = "borrow_state", issue = "27733")]
+    #[rustc_deprecated(since = "1.15.0", reason = "use `try_borrow` instead")]
+    #[allow(deprecated)]
     #[inline]
     pub fn borrow_state(&self) -> BorrowState {
         match self.borrow.get() {
@@ -888,9 +892,7 @@ impl<'b, T: ?Sized> Ref<'b, T> {
     /// `Ref::clone(...)`.  A `Clone` implementation or a method would interfere
     /// with the widespread use of `r.borrow().clone()` to clone the contents of
     /// a `RefCell`.
-    #[unstable(feature = "cell_extras",
-               reason = "likely to be moved to a method, pending language changes",
-               issue = "27746")]
+    #[stable(feature = "cell_extras", since = "1.15.0")]
     #[inline]
     pub fn clone(orig: &Ref<'b, T>) -> Ref<'b, T> {
         Ref {

src/libcore/char.rs

@@ -327,9 +327,9 @@ pub trait CharExt {
     fn len_utf8(self) -> usize;
     #[stable(feature = "core", since = "1.6.0")]
     fn len_utf16(self) -> usize;
-    #[unstable(feature = "unicode", issue = "27784")]
+    #[stable(feature = "unicode_encode_char", since = "1.15.0")]
     fn encode_utf8(self, dst: &mut [u8]) -> &mut str;
-    #[unstable(feature = "unicode", issue = "27784")]
+    #[stable(feature = "unicode_encode_char", since = "1.15.0")]
     fn encode_utf16(self, dst: &mut [u16]) -> &mut [u16];
 }
 

src/libcore/fmt/mod.rs

@@ -12,7 +12,7 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-use cell::{UnsafeCell, Cell, RefCell, Ref, RefMut, BorrowState};
+use cell::{UnsafeCell, Cell, RefCell, Ref, RefMut};
 use marker::PhantomData;
 use mem;
 use num::flt2dec;
@@ -1634,13 +1634,13 @@ impl<T: Copy + Debug> Debug for Cell<T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized + Debug> Debug for RefCell<T> {
     fn fmt(&self, f: &mut Formatter) -> Result {
-        match self.borrow_state() {
-            BorrowState::Unused | BorrowState::Reading => {
+        match self.try_borrow() {
+            Ok(borrow) => {
                 f.debug_struct("RefCell")
-                    .field("value", &self.borrow())
+                    .field("value", &borrow)
                     .finish()
             }
-            BorrowState::Writing => {
+            Err(_) => {
                 f.debug_struct("RefCell")
                     .field("value", &"<borrowed>")
                     .finish()

src/libcore/iter/iterator.rs

@@ -1696,12 +1696,11 @@ pub trait Iterator {
     /// # Examples
     ///
     /// ```
-    /// #![feature(iter_max_by)]
     /// let a = [-3_i32, 0, 1, 5, -10];
     /// assert_eq!(*a.iter().max_by(|x, y| x.cmp(y)).unwrap(), 5);
     /// ```
     #[inline]
-    #[unstable(feature = "iter_max_by", issue="36105")]
+    #[stable(feature = "iter_max_by", since = "1.15.0")]
     fn max_by<F>(self, mut compare: F) -> Option<Self::Item>
         where Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Ordering,
     {
@@ -1746,12 +1745,11 @@ pub trait Iterator {
     /// # Examples
     ///
     /// ```
-    /// #![feature(iter_min_by)]
     /// let a = [-3_i32, 0, 1, 5, -10];
     /// assert_eq!(*a.iter().min_by(|x, y| x.cmp(y)).unwrap(), -10);
     /// ```
     #[inline]
-    #[unstable(feature = "iter_min_by", issue="36105")]
+    #[stable(feature = "iter_min_by", since = "1.15.0")]
     fn min_by<F>(self, mut compare: F) -> Option<Self::Item>
         where Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Ordering,
     {

src/libcore/sync/atomic.rs

@@ -203,7 +203,6 @@ impl AtomicBool {
     /// # Examples
     ///
     /// ```
-    /// #![feature(atomic_access)]
     /// use std::sync::atomic::{AtomicBool, Ordering};
     ///
     /// let mut some_bool = AtomicBool::new(true);
@@ -212,7 +211,7 @@ impl AtomicBool {
     /// assert_eq!(some_bool.load(Ordering::SeqCst), false);
     /// ```
     #[inline]
-    #[unstable(feature = "atomic_access", issue = "35603")]
+    #[stable(feature = "atomic_access", since = "1.15.0")]
     pub fn get_mut(&mut self) -> &mut bool {
         unsafe { &mut *(self.v.get() as *mut bool) }
     }
@@ -225,14 +224,13 @@ impl AtomicBool {
     /// # Examples
     ///
     /// ```
-    /// #![feature(atomic_access)]
     /// use std::sync::atomic::AtomicBool;
     ///
     /// let some_bool = AtomicBool::new(true);
     /// assert_eq!(some_bool.into_inner(), true);
     /// ```
     #[inline]
-    #[unstable(feature = "atomic_access", issue = "35603")]
+    #[stable(feature = "atomic_access", since = "1.15.0")]
     pub fn into_inner(self) -> bool {
         unsafe { self.v.into_inner() != 0 }
     }
@@ -588,15 +586,14 @@ impl<T> AtomicPtr<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(atomic_access)]
     /// use std::sync::atomic::{AtomicPtr, Ordering};
     ///
     /// let mut atomic_ptr = AtomicPtr::new(&mut 10);
     /// *atomic_ptr.get_mut() = &mut 5;
     /// assert_eq!(unsafe { *atomic_ptr.load(Ordering::SeqCst) }, 5);
     /// ```
     #[inline]
-    #[unstable(feature = "atomic_access", issue = "35603")]
+    #[stable(feature = "atomic_access", since = "1.15.0")]
     pub fn get_mut(&mut self) -> &mut *mut T {
         unsafe { &mut *self.p.get() }
     }
@@ -609,14 +606,13 @@ impl<T> AtomicPtr<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(atomic_access)]
     /// use std::sync::atomic::AtomicPtr;
     ///
     /// let atomic_ptr = AtomicPtr::new(&mut 5);
     /// assert_eq!(unsafe { *atomic_ptr.into_inner() }, 5);
     /// ```
     #[inline]
-    #[unstable(feature = "atomic_access", issue = "35603")]
+    #[stable(feature = "atomic_access", since = "1.15.0")]
     pub fn into_inner(self) -> *mut T {
         unsafe { self.p.into_inner() }
     }
@@ -883,7 +879,6 @@ macro_rules! atomic_int {
             /// # Examples
             ///
             /// ```
-            /// #![feature(atomic_access)]
             /// use std::sync::atomic::{AtomicIsize, Ordering};
             ///
             /// let mut some_isize = AtomicIsize::new(10);
@@ -905,7 +900,6 @@ macro_rules! atomic_int {
             /// # Examples
             ///
             /// ```
-            /// #![feature(atomic_access)]
             /// use std::sync::atomic::AtomicIsize;
             ///
             /// let some_isize = AtomicIsize::new(5);
@@ -1261,15 +1255,15 @@ atomic_int!{
     stable(feature = "rust1", since = "1.0.0"),
     stable(feature = "extended_compare_and_swap", since = "1.10.0"),
     stable(feature = "atomic_debug", since = "1.3.0"),
-    unstable(feature = "atomic_access", issue = "35603"),
+    stable(feature = "atomic_access", since = "1.15.0"),
     isize AtomicIsize ATOMIC_ISIZE_INIT
 }
 #[cfg(target_has_atomic = "ptr")]
 atomic_int!{
     stable(feature = "rust1", since = "1.0.0"),
     stable(feature = "extended_compare_and_swap", since = "1.10.0"),
     stable(feature = "atomic_debug", since = "1.3.0"),
-    unstable(feature = "atomic_access", issue = "35603"),
+    stable(feature = "atomic_access", since = "1.15.0"),
     usize AtomicUsize ATOMIC_USIZE_INIT
 }