Rollup merge of rust-lang#128279 - slanterns:is_sorted, r=dtolnay

Stabilize `is_sorted`

Closes: rust-lang#53485.

~~Question: does~~ https://github.com/rust-lang/rust/blob/8fe0c753f23e7050b87a444b6622caf4d2272d5d/compiler/rustc_lint_defs/src/builtin.rs#L1986-L1994 ~~need a new example?~~
edit: It causes a test failure and needs to be changed anyway.

``@rustbot`` label: +T-libs-api

r? libs-api

alloc/src/lib.rs

@@ -92,7 +92,6 @@
 // tidy-alphabetical-start
 #![cfg_attr(not(no_global_oom_handling), feature(const_alloc_error))]
 #![cfg_attr(not(no_global_oom_handling), feature(const_btree_len))]
-#![cfg_attr(test, feature(is_sorted))]
 #![cfg_attr(test, feature(new_uninit))]
 #![feature(alloc_layout_extra)]
 #![feature(allocator_api)]

core/src/iter/traits/iterator.rs

@@ -3951,16 +3951,14 @@ pub trait Iterator {
     /// # Examples
     ///
     /// ```
-    /// #![feature(is_sorted)]
-    ///
     /// assert!([1, 2, 2, 9].iter().is_sorted());
     /// assert!(![1, 3, 2, 4].iter().is_sorted());
     /// assert!([0].iter().is_sorted());
     /// assert!(std::iter::empty::<i32>().is_sorted());
     /// assert!(![0.0, 1.0, f32::NAN].iter().is_sorted());
     /// ```
     #[inline]
-    #[unstable(feature = "is_sorted", reason = "new API", issue = "53485")]
+    #[stable(feature = "is_sorted", since = "CURRENT_RUSTC_VERSION")]
     #[rustc_do_not_const_check]
     fn is_sorted(self) -> bool
     where
@@ -3978,8 +3976,6 @@ pub trait Iterator {
     /// # Examples
     ///
     /// ```
-    /// #![feature(is_sorted)]
-    ///
     /// assert!([1, 2, 2, 9].iter().is_sorted_by(|a, b| a <= b));
     /// assert!(![1, 2, 2, 9].iter().is_sorted_by(|a, b| a < b));
     ///
@@ -3989,7 +3985,7 @@ pub trait Iterator {
     /// assert!(std::iter::empty::<i32>().is_sorted_by(|a, b| false));
     /// assert!(std::iter::empty::<i32>().is_sorted_by(|a, b| true));
     /// ```
-    #[unstable(feature = "is_sorted", reason = "new API", issue = "53485")]
+    #[stable(feature = "is_sorted", since = "CURRENT_RUSTC_VERSION")]
     #[rustc_do_not_const_check]
     fn is_sorted_by<F>(mut self, compare: F) -> bool
     where
@@ -4030,13 +4026,11 @@ pub trait Iterator {
     /// # Examples
     ///
     /// ```
-    /// #![feature(is_sorted)]
-    ///
     /// assert!(["c", "bb", "aaa"].iter().is_sorted_by_key(|s| s.len()));
     /// assert!(![-2i32, -1, 0, 3].iter().is_sorted_by_key(|n| n.abs()));
     /// ```
     #[inline]
-    #[unstable(feature = "is_sorted", reason = "new API", issue = "53485")]
+    #[stable(feature = "is_sorted", since = "CURRENT_RUSTC_VERSION")]
     #[rustc_do_not_const_check]
     fn is_sorted_by_key<F, K>(self, f: F) -> bool
     where

core/src/slice/mod.rs

@@ -4069,7 +4069,6 @@ impl<T> [T] {
     /// # Examples
     ///
     /// ```
-    /// #![feature(is_sorted)]
     /// let empty: [i32; 0] = [];
     ///
     /// assert!([1, 2, 2, 9].is_sorted());
@@ -4079,7 +4078,7 @@ impl<T> [T] {
     /// assert!(![0.0, 1.0, f32::NAN].is_sorted());
     /// ```
     #[inline]
-    #[unstable(feature = "is_sorted", reason = "new API", issue = "53485")]
+    #[stable(feature = "is_sorted", since = "CURRENT_RUSTC_VERSION")]
     #[must_use]
     pub fn is_sorted(&self) -> bool
     where
@@ -4096,8 +4095,6 @@ impl<T> [T] {
     /// # Examples
     ///
     /// ```
-    /// #![feature(is_sorted)]
-    ///
     /// assert!([1, 2, 2, 9].is_sorted_by(|a, b| a <= b));
     /// assert!(![1, 2, 2, 9].is_sorted_by(|a, b| a < b));
     ///
@@ -4108,7 +4105,7 @@ impl<T> [T] {
     /// assert!(empty.is_sorted_by(|a, b| false));
     /// assert!(empty.is_sorted_by(|a, b| true));
     /// ```
-    #[unstable(feature = "is_sorted", reason = "new API", issue = "53485")]
+    #[stable(feature = "is_sorted", since = "CURRENT_RUSTC_VERSION")]
     #[must_use]
     pub fn is_sorted_by<'a, F>(&'a self, mut compare: F) -> bool
     where
@@ -4128,13 +4125,11 @@ impl<T> [T] {
     /// # Examples
     ///
     /// ```
-    /// #![feature(is_sorted)]
-    ///
     /// assert!(["c", "bb", "aaa"].is_sorted_by_key(|s| s.len()));
     /// assert!(![-2i32, -1, 0, 3].is_sorted_by_key(|n| n.abs()));
     /// ```
     #[inline]
-    #[unstable(feature = "is_sorted", reason = "new API", issue = "53485")]
+    #[stable(feature = "is_sorted", since = "CURRENT_RUSTC_VERSION")]
     #[must_use]
     pub fn is_sorted_by_key<'a, F, K>(&'a self, f: F) -> bool
     where

core/tests/lib.rs

@@ -44,7 +44,6 @@
 #![feature(hasher_prefixfree_extras)]
 #![feature(hashmap_internals)]
 #![feature(try_find)]
-#![feature(is_sorted)]
 #![feature(layout_for_ptr)]
 #![feature(pattern)]
 #![feature(slice_take)]