Rollup merge of #41437 - cuviper:remove-unstable-deprecated, r=alexcr…

…ichton

Remove items that are unstable and deprecated

This removes unstable items that have been deprecated for more than one cycle.

- Since 1.16.0, `#![feature(enumset)]`
    - All of `mod collections::enum_set`
- Since 1.15.0, `#![feature(borrow_state)]`
    - `cell::BorrowState`
    - `RefCell::borrow_state()`
- Since 1.15.0, `#![feature(is_unique)]`
    - `Rc::is_unique()` (made private like `Arc::is_unique()`)
- Since 1.15.0, `#![feature(rc_would_unwrap)]`
    - `Rc::would_wrap()`
- Since 1.13.0, `#![feature(binary_heap_extras)]`
    - `BinaryHeap::push_pop()`
    - `BinaryHeap::replace()`
- Since 1.12.0, `#![feature(as_unsafe_cell)]`
    - `Cell::as_unsafe_cell()`
    - `RefCell::as_unsafe_cell()`
- Since 1.12.0, `#![feature(map_entry_recover_keys)]`
    - `btree_map::OccupiedEntry::remove_pair()`
    - `hash_map::OccupiedEntry::remove_pair()`
- Since 1.11.0, `#![feature(float_extras)]`
    - `Float::nan()`
    - `Float::infinity()`
    - `Float::neg_infinity()`
    - `Float::neg_zero()`
    - `Float::zero()`
    - `Float::one()`
    - `Float::integer_decode()`
    - `f32::integer_decode()`
    - `f32::ldexp()`
    - `f32::frexp()`
    - `f32::next_after()`
    - `f64::integer_decode()`
    - `f64::ldexp()`
    - `f64::frexp()`
    - `f64::next_after()`
- Since 1.11.0, `#![feature(zero_one)]`
    - `num::Zero`
    - `num::One`

src/doc/unstable-book/src/SUMMARY.md

@@ -101,11 +101,8 @@
  - [alloc_system](library-features/alloc-system.md)
  - [alloc](library-features/alloc.md)
  - [as_c_str](library-features/as-c-str.md)
- - [as_unsafe_cell](library-features/as-unsafe-cell.md)
  - [ascii_ctype](library-features/ascii-ctype.md)
- - [binary_heap_extras](library-features/binary-heap-extras.md)
  - [binary_heap_peek_mut_pop](library-features/binary-heap-peek-mut-pop.md)
- - [borrow_state](library-features/borrow-state.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)
@@ -130,14 +127,12 @@
  - [derive_clone_copy](library-features/derive-clone-copy.md)
  - [derive_eq](library-features/derive-eq.md)
  - [discriminant_value](library-features/discriminant-value.md)
- - [enumset](library-features/enumset.md)
  - [error_type_id](library-features/error-type-id.md)
  - [exact_size_is_empty](library-features/exact-size-is-empty.md)
  - [fd](library-features/fd.md)
  - [fd_read](library-features/fd-read.md)
  - [fixed_size_array](library-features/fixed-size-array.md)
  - [float_bits_conv](library-features/float-bits-conv.md)
- - [float_extras](library-features/float-extras.md)
  - [flt2dec](library-features/flt2dec.md)
  - [fmt_flags_align](library-features/fmt-flags-align.md)
  - [fmt_internals](library-features/fmt-internals.md)
@@ -157,15 +152,13 @@
  - [io_error_internals](library-features/io-error-internals.md)
  - [io](library-features/io.md)
  - [ip](library-features/ip.md)
- - [is_unique](library-features/is-unique.md)
  - [iter_rfind](library-features/iter-rfind.md)
  - [libstd_io_internals](library-features/libstd-io-internals.md)
  - [libstd_sys_internals](library-features/libstd-sys-internals.md)
  - [libstd_thread_internals](library-features/libstd-thread-internals.md)
  - [linked_list_extras](library-features/linked-list-extras.md)
  - [lookup_host](library-features/lookup-host.md)
  - [manually_drop](library-features/manually-drop.md)
- - [map_entry_recover_keys](library-features/map-entry-recover-keys.md)
  - [mpsc_select](library-features/mpsc-select.md)
  - [n16](library-features/n16.md)
  - [never_type_impls](library-features/never-type-impls.md)
@@ -188,7 +181,6 @@
  - [rand](library-features/rand.md)
  - [range_contains](library-features/range-contains.md)
  - [raw](library-features/raw.md)
- - [rc_would_unwrap](library-features/rc-would-unwrap.md)
  - [retain_hash_collection](library-features/retain-hash-collection.md)
  - [reverse_cmp_key](library-features/reverse-cmp-key.md)
  - [rt](library-features/rt.md)
@@ -224,5 +216,3 @@
  - [windows_handle](library-features/windows-handle.md)
  - [windows_net](library-features/windows-net.md)
  - [windows_stdio](library-features/windows-stdio.md)
- - [zero_one](library-features/zero-one.md)
->>>>>> Add top level sections to the Unstable Book.

src/liballoc/rc.rs

@@ -341,19 +341,6 @@ impl<T> Rc<T> {
  }
  }
 
- /// Checks whether [`Rc::try_unwrap`][try_unwrap] would return
- /// [`Ok`].
- ///
- /// [try_unwrap]: struct.Rc.html#method.try_unwrap
- /// [`Ok`]: ../../std/result/enum.Result.html#variant.Ok
- #[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
- }
-
  /// Consumes the `Rc`, returning the wrapped pointer.
  ///
  /// To avoid a memory leak the pointer must be converted back to an `Rc` using
@@ -501,11 +488,7 @@ impl<T: ?Sized> Rc<T> {
  ///
  /// [weak]: struct.Weak.html
  #[inline]
- #[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 {
+ fn is_unique(this: &Self) -> bool {
  Rc::weak_count(this) == 0 && Rc::strong_count(this) == 1
  }
 

src/libcollections/binary_heap.rs

@@ -555,82 +555,6 @@ impl<T: Ord> BinaryHeap<T> {
  self.sift_up(0, old_len);
  }
 
- /// Pushes an item onto the binary heap, then pops the greatest item off the queue in
- /// an optimized fashion.
- ///
- /// # Examples
- ///
- /// Basic usage:
- ///
- /// ```
- /// #![feature(binary_heap_extras)]
- /// #![allow(deprecated)]
- ///
- /// use std::collections::BinaryHeap;
- /// let mut heap = BinaryHeap::new();
- /// heap.push(1);
- /// heap.push(5);
- ///
- /// assert_eq!(heap.push_pop(3), 5);
- /// assert_eq!(heap.push_pop(9), 9);
- /// assert_eq!(heap.len(), 2);
- /// assert_eq!(heap.peek(), Some(&3));
- /// ```
- #[unstable(feature = "binary_heap_extras",
- reason = "needs to be audited",
- issue = "28147")]
- #[rustc_deprecated(since = "1.13.0", reason = "use `peek_mut` instead")]
- pub fn push_pop(&mut self, mut item: T) -> T {
- match self.data.get_mut(0) {
- None => return item,
- Some(top) => {
- if *top > item {
- swap(&mut item, top);
- } else {
- return item;
- }
- }
- }
-
- self.sift_down(0);
- item
- }
-
- /// Pops the greatest item off the binary heap, then pushes an item onto the queue in
- /// an optimized fashion. The push is done regardless of whether the binary heap
- /// was empty.
- ///
- /// # Examples
- ///
- /// Basic usage:
- ///
- /// ```
- /// #![feature(binary_heap_extras)]
- /// #![allow(deprecated)]
- ///
- /// use std::collections::BinaryHeap;
- /// let mut heap = BinaryHeap::new();
- ///
- /// assert_eq!(heap.replace(1), None);
- /// assert_eq!(heap.replace(3), Some(1));
- /// assert_eq!(heap.len(), 1);
- /// assert_eq!(heap.peek(), Some(&3));
- /// ```
- #[unstable(feature = "binary_heap_extras",
- reason = "needs to be audited",
- issue = "28147")]
- #[rustc_deprecated(since = "1.13.0", reason = "use `peek_mut` instead")]
- pub fn replace(&mut self, mut item: T) -> Option<T> {
- if !self.is_empty() {
- swap(&mut item, &mut self.data[0]);
- self.sift_down(0);
- Some(item)
- } else {
- self.push(item);
- None
- }
- }
-
  /// Consumes the `BinaryHeap` and returns the underlying vector
  /// in arbitrary order.
  ///

src/libcollections/btree/map.rs

@@ -2217,13 +2217,6 @@ impl<'a, K: Ord, V> OccupiedEntry<'a, K, V> {
  self.handle.reborrow().into_kv().0
  }
 
- /// Deprecated, renamed to `remove_entry`
- #[unstable(feature = "map_entry_recover_keys", issue = "34285")]
- #[rustc_deprecated(since = "1.12.0", reason = "renamed to `remove_entry`")]
- pub fn remove_pair(self) -> (K, V) {
- self.remove_entry()
- }
-
  /// Take ownership of the key and value from the map.
  ///
  /// # Examples