Rollup merge of rust-lang#56401 - scottmcm:vecdeque-resize-with, r=dtolnay

Move VecDeque::resize_with out of the impl<T:Clone> block

I put this in the wrong `impl` block in rust-lang#56016, so fixing.

Tracking issue for the unstable method: rust-lang#41758 (comment)

Author: Centril

src/liballoc/collections/vec_deque.rs

@@ -19,7 +19,7 @@
 
 use core::cmp::Ordering;
 use core::fmt;
-use core::iter::{repeat, repeat_with, FromIterator, FusedIterator};
+use core::iter::{repeat_with, FromIterator, FusedIterator};
 use core::mem;
 use core::ops::Bound::{Excluded, Included, Unbounded};
 use core::ops::{Index, IndexMut, RangeBounds};
@@ -1886,16 +1886,16 @@ impl<T> VecDeque<T> {
             debug_assert!(!self.is_full());
         }
     }
-}
 
-impl<T: Clone> VecDeque<T> {
-    /// Modifies the `VecDeque` in-place so that `len()` is equal to new_len,
-    /// either by removing excess elements from the back or by appending clones of `value`
-    /// to the back.
+    /// Modifies the `VecDeque` in-place so that `len()` is equal to `new_len`,
+    /// either by removing excess elements from the back or by appending
+    /// elements generated by calling `generator` to the back.
     ///
     /// # Examples
     ///
     /// ```
+    /// #![feature(vec_resize_with)]
+    ///
     /// use std::collections::VecDeque;
     ///
     /// let mut buf = VecDeque::new();
@@ -1904,32 +1904,36 @@ impl<T: Clone> VecDeque<T> {
     /// buf.push_back(15);
     /// assert_eq!(buf, [5, 10, 15]);
     ///
-    /// buf.resize(2, 0);
+    /// buf.resize_with(5, Default::default);
+    /// assert_eq!(buf, [5, 10, 15, 0, 0]);
+    ///
+    /// buf.resize_with(2, || unreachable!());
     /// assert_eq!(buf, [5, 10]);
     ///
-    /// buf.resize(5, 20);
-    /// assert_eq!(buf, [5, 10, 20, 20, 20]);
+    /// let mut state = 100;
+    /// buf.resize_with(5, || { state += 1; state });
+    /// assert_eq!(buf, [5, 10, 101, 102, 103]);
     /// ```
-    #[stable(feature = "deque_extras", since = "1.16.0")]
-    pub fn resize(&mut self, new_len: usize, value: T) {
+    #[unstable(feature = "vec_resize_with", issue = "41758")]
+    pub fn resize_with(&mut self, new_len: usize, generator: impl FnMut()->T) {
         let len = self.len();
 
         if new_len > len {
-            self.extend(repeat(value).take(new_len - len))
+            self.extend(repeat_with(generator).take(new_len - len))
         } else {
             self.truncate(new_len);
         }
     }
+}
 
-    /// Modifies the `VecDeque` in-place so that `len()` is equal to `new_len`,
-    /// either by removing excess elements from the back or by appending
-    /// elements generated by calling `generator` to the back.
+impl<T: Clone> VecDeque<T> {
+    /// Modifies the `VecDeque` in-place so that `len()` is equal to new_len,
+    /// either by removing excess elements from the back or by appending clones of `value`
+    /// to the back.
     ///
     /// # Examples
     ///
     /// ```
-    /// #![feature(vec_resize_with)]
-    ///
     /// use std::collections::VecDeque;
     ///
     /// let mut buf = VecDeque::new();
@@ -1938,25 +1942,15 @@ impl<T: Clone> VecDeque<T> {
     /// buf.push_back(15);
     /// assert_eq!(buf, [5, 10, 15]);
     ///
-    /// buf.resize_with(5, Default::default);
-    /// assert_eq!(buf, [5, 10, 15, 0, 0]);
-    ///
-    /// buf.resize_with(2, || unreachable!());
+    /// buf.resize(2, 0);
     /// assert_eq!(buf, [5, 10]);
     ///
-    /// let mut state = 100;
-    /// buf.resize_with(5, || { state += 1; state });
-    /// assert_eq!(buf, [5, 10, 101, 102, 103]);
+    /// buf.resize(5, 20);
+    /// assert_eq!(buf, [5, 10, 20, 20, 20]);
     /// ```
-    #[unstable(feature = "vec_resize_with", issue = "41758")]
-    pub fn resize_with(&mut self, new_len: usize, generator: impl FnMut()->T) {
-        let len = self.len();
-
-        if new_len > len {
-            self.extend(repeat_with(generator).take(new_len - len))
-        } else {
-            self.truncate(new_len);
-        }
+    #[stable(feature = "deque_extras", since = "1.16.0")]
+    pub fn resize(&mut self, new_len: usize, value: T) {
+        self.resize_with(new_len, || value.clone());
     }
 }