Rollup merge of rust-lang#134310 - tkr-sh:master, r=Noratrieb

Add clarity to the examples of some `Vec` & `VecDeque` methods

In some `Vec` and `VecDeque` examples where elements are `i32`, examples can seem a bit confusing at first glance if a parameter of the method is an `usize`.

In this case, I think it's better to use `char` rather than `i32`.

> [!NOTE]
> It's already done in the implementation of `VecDeque::insert`

#### Difference

- `i32`
```rs
let mut v = vec![1, 2, 3];
assert_eq!(v.remove(1), 2);
assert_eq!(v, [1, 3]);
```
- `char`
```rs
let mut v = vec!['a', 'b', 'c'];
assert_eq!(v.remove(1), 'b');
assert_eq!(v, ['a', 'c']);
```

Even tho it's pretty minor, it's a nice to have.

Author: Zalathar

library/alloc/src/collections/vec_deque/mod.rs

@@ -1869,7 +1869,7 @@ impl<T, A: Allocator> VecDeque<T, A> {
     ///
     /// # Panics
     ///
-    /// Panics if `index` is greater than deque's length
+    /// Panics if `index` is strictly greater than deque's length
     ///
     /// # Examples
     ///
@@ -1884,6 +1884,9 @@ impl<T, A: Allocator> VecDeque<T, A> {
     ///
     /// vec_deque.insert(1, 'd');
     /// assert_eq!(vec_deque, &['a', 'd', 'b', 'c']);
+    ///
+    /// vec_deque.insert(4, 'e');
+    /// assert_eq!(vec_deque, &['a', 'd', 'b', 'c', 'e']);
     /// ```
     #[stable(feature = "deque_extras_15", since = "1.5.0")]
     #[track_caller]
@@ -1928,13 +1931,13 @@ impl<T, A: Allocator> VecDeque<T, A> {
     /// use std::collections::VecDeque;
     ///
     /// let mut buf = VecDeque::new();
-    /// buf.push_back(1);
-    /// buf.push_back(2);
-    /// buf.push_back(3);
-    /// assert_eq!(buf, [1, 2, 3]);
+    /// buf.push_back('a');
+    /// buf.push_back('b');
+    /// buf.push_back('c');
+    /// assert_eq!(buf, ['a', 'b', 'c']);
     ///
-    /// assert_eq!(buf.remove(1), Some(2));
-    /// assert_eq!(buf, [1, 3]);
+    /// assert_eq!(buf.remove(1), Some('b'));
+    /// assert_eq!(buf, ['a', 'c']);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_confusables("delete", "take")]
@@ -1982,10 +1985,10 @@ impl<T, A: Allocator> VecDeque<T, A> {
     /// ```
     /// use std::collections::VecDeque;
     ///
-    /// let mut buf: VecDeque<_> = [1, 2, 3].into();
+    /// let mut buf: VecDeque<_> = ['a', 'b', 'c'].into();
     /// let buf2 = buf.split_off(1);
-    /// assert_eq!(buf, [1]);
-    /// assert_eq!(buf2, [2, 3]);
+    /// assert_eq!(buf, ['a']);
+    /// assert_eq!(buf2, ['b', 'c']);
     /// ```
     #[inline]
     #[must_use = "use `.truncate()` if you don't need the other half"]

library/alloc/src/vec/mod.rs

@@ -1953,11 +1953,11 @@ impl<T, A: Allocator> Vec<T, A> {
     /// # Examples
     ///
     /// ```
-    /// let mut vec = vec![1, 2, 3];
-    /// vec.insert(1, 4);
-    /// assert_eq!(vec, [1, 4, 2, 3]);
-    /// vec.insert(4, 5);
-    /// assert_eq!(vec, [1, 4, 2, 3, 5]);
+    /// let mut vec = vec!['a', 'b', 'c'];
+    /// vec.insert(1, 'd');
+    /// assert_eq!(vec, ['a', 'd', 'b', 'c']);
+    /// vec.insert(4, 'e');
+    /// assert_eq!(vec, ['a', 'd', 'b', 'c', 'e']);
     /// ```
     ///
     /// # Time complexity
@@ -2024,9 +2024,9 @@ impl<T, A: Allocator> Vec<T, A> {
     /// # Examples
     ///
     /// ```
-    /// let mut v = vec![1, 2, 3];
-    /// assert_eq!(v.remove(1), 2);
-    /// assert_eq!(v, [1, 3]);
+    /// let mut v = vec!['a', 'b', 'c'];
+    /// assert_eq!(v.remove(1), 'b');
+    /// assert_eq!(v, ['a', 'c']);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     #[track_caller]
@@ -2715,10 +2715,10 @@ impl<T, A: Allocator> Vec<T, A> {
     /// # Examples
     ///
     /// ```
-    /// let mut vec = vec![1, 2, 3];
+    /// let mut vec = vec!['a', 'b', 'c'];
     /// let vec2 = vec.split_off(1);
-    /// assert_eq!(vec, [1]);
-    /// assert_eq!(vec2, [2, 3]);
+    /// assert_eq!(vec, ['a']);
+    /// assert_eq!(vec2, ['b', 'c']);
     /// ```
     #[cfg(not(no_global_oom_handling))]
     #[inline]
@@ -2982,9 +2982,9 @@ impl<T: Clone, A: Allocator> Vec<T, A> {
     /// vec.resize(3, "world");
     /// assert_eq!(vec, ["hello", "world", "world"]);
     ///
-    /// let mut vec = vec![1, 2, 3, 4];
-    /// vec.resize(2, 0);
-    /// assert_eq!(vec, [1, 2]);
+    /// let mut vec = vec!['a', 'b', 'c', 'd'];
+    /// vec.resize(2, '_');
+    /// assert_eq!(vec, ['a', 'b']);
     /// ```
     #[cfg(not(no_global_oom_handling))]
     #[stable(feature = "vec_resize", since = "1.5.0")]

library/core/src/slice/mod.rs

@@ -1883,23 +1883,23 @@ impl<T> [T] {
     /// # Examples
     ///
     /// ```
-    /// let v = [1, 2, 3, 4, 5, 6];
+    /// let v = ['a', 'b', 'c'];
     ///
     /// {
     ///    let (left, right) = v.split_at(0);
     ///    assert_eq!(left, []);
-    ///    assert_eq!(right, [1, 2, 3, 4, 5, 6]);
+    ///    assert_eq!(right, ['a', 'b', 'c']);
     /// }
     ///
     /// {
     ///     let (left, right) = v.split_at(2);
-    ///     assert_eq!(left, [1, 2]);
-    ///     assert_eq!(right, [3, 4, 5, 6]);
+    ///     assert_eq!(left, ['a', 'b']);
+    ///     assert_eq!(right, ['c']);
     /// }
     ///
     /// {
-    ///     let (left, right) = v.split_at(6);
-    ///     assert_eq!(left, [1, 2, 3, 4, 5, 6]);
+    ///     let (left, right) = v.split_at(3);
+    ///     assert_eq!(left, ['a', 'b', 'c']);
     ///     assert_eq!(right, []);
     /// }
     /// ```
@@ -1969,23 +1969,23 @@ impl<T> [T] {
     /// # Examples
     ///
     /// ```
-    /// let v = [1, 2, 3, 4, 5, 6];
+    /// let v = ['a', 'b', 'c'];
     ///
     /// unsafe {
     ///    let (left, right) = v.split_at_unchecked(0);
     ///    assert_eq!(left, []);
-    ///    assert_eq!(right, [1, 2, 3, 4, 5, 6]);
+    ///    assert_eq!(right, ['a', 'b', 'c']);
     /// }
     ///
     /// unsafe {
     ///     let (left, right) = v.split_at_unchecked(2);
-    ///     assert_eq!(left, [1, 2]);
-    ///     assert_eq!(right, [3, 4, 5, 6]);
+    ///     assert_eq!(left, ['a', 'b']);
+    ///     assert_eq!(right, ['c']);
     /// }
     ///
     /// unsafe {
-    ///     let (left, right) = v.split_at_unchecked(6);
-    ///     assert_eq!(left, [1, 2, 3, 4, 5, 6]);
+    ///     let (left, right) = v.split_at_unchecked(3);
+    ///     assert_eq!(left, ['a', 'b', 'c']);
     ///     assert_eq!(right, []);
     /// }
     /// ```