Auto merge of #79275 - integer32llc:doc-style, r=jonas-schievink

More consistently use spaces after commas in lists in docs

This PR changes instances of lists that didn't use spaces after commas, like `vec![1,2,3]`, to `vec![1, 2, 3]` to be more consistent with idiomatic Rust style (the way these were looks strange to me, especially because there are often lists that *do* use spaces after the commas later in the same code block 😬).

I noticed one of these in an example in the stdlib docs and went looking for more, but as far as I can see, I'm only changing those spots in user-facing documentation or rustc output, and the changes make no semantic difference.

compiler/rustc_lint/src/unused.rs

@@ -1152,7 +1152,7 @@ fn check_item(&mut self, cx: &EarlyContext<'_>, item: &ast::Item) {
     /// ```rust
     /// #![feature(box_syntax)]
     /// fn main() {
-    ///     let a = (box [1,2,3]).len();
+    ///     let a = (box [1, 2, 3]).len();
     /// }
     /// ```
     ///

compiler/rustc_lint_defs/src/builtin.rs

@@ -1719,7 +1719,7 @@
     ///
     /// impl<T: ?Sized> MyIterator for T where T: Iterator { }
     ///
-    /// let x = vec![1,2,3];
+    /// let x = vec![1, 2, 3];
     /// let _ = x.iter().is_sorted();
     /// ```
     ///

library/alloc/src/collections/btree/map.rs

@@ -1037,7 +1037,7 @@ pub fn range_mut<T: ?Sized, R>(&mut self, range: R) -> RangeMut<'_, K, V>
     /// let mut count: BTreeMap<&str, usize> = BTreeMap::new();
     ///
     /// // count the number of occurrences of letters in the vec
-    /// for x in vec!["a","b","a","c","a","b"] {
+    /// for x in vec!["a", "b", "a", "c", "a", "b"] {
     ///     *count.entry(x).or_insert(0) += 1;
     /// }
     ///

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

@@ -1962,7 +1962,7 @@ pub fn remove(&mut self, index: usize) -> Option<T> {
     /// ```
     /// use std::collections::VecDeque;
     ///
-    /// let mut buf: VecDeque<_> = vec![1,2,3].into_iter().collect();
+    /// let mut buf: VecDeque<_> = vec![1, 2, 3].into_iter().collect();
     /// let buf2 = buf.split_off(1);
     /// assert_eq!(buf, [1]);
     /// assert_eq!(buf2, [2, 3]);
@@ -2514,10 +2514,10 @@ pub fn binary_search_by<'a, F>(&'a self, mut f: F) -> Result<usize, usize>
     ///          (3, 1), (1, 2), (2, 3), (4, 5), (5, 8), (3, 13),
     ///          (1, 21), (2, 34), (4, 55)].into();
     ///
-    /// assert_eq!(deque.binary_search_by_key(&13, |&(a,b)| b),  Ok(9));
-    /// assert_eq!(deque.binary_search_by_key(&4, |&(a,b)| b),   Err(7));
-    /// assert_eq!(deque.binary_search_by_key(&100, |&(a,b)| b), Err(13));
-    /// let r = deque.binary_search_by_key(&1, |&(a,b)| b);
+    /// assert_eq!(deque.binary_search_by_key(&13, |&(a, b)| b),  Ok(9));
+    /// assert_eq!(deque.binary_search_by_key(&4, |&(a, b)| b),   Err(7));
+    /// assert_eq!(deque.binary_search_by_key(&100, |&(a, b)| b), Err(13));
+    /// let r = deque.binary_search_by_key(&1, |&(a, b)| b);
     /// assert!(matches!(r, Ok(1..=4)));
     /// ```
     #[unstable(feature = "vecdeque_binary_search", issue = "78021")]

library/alloc/src/vec.rs

@@ -1041,7 +1041,7 @@ pub fn as_ptr(&self) -> *const T {
     ///     }
     ///     x.set_len(size);
     /// }
-    /// assert_eq!(&*x, &[0,1,2,3]);
+    /// assert_eq!(&*x, &[0, 1, 2, 3]);
     /// ```
     #[stable(feature = "vec_as_ptr", since = "1.37.0")]
     #[inline]
@@ -1594,7 +1594,7 @@ pub fn is_empty(&self) -> bool {
     /// # Examples
     ///
     /// ```
-    /// let mut vec = vec![1,2,3];
+    /// let mut vec = vec![1, 2, 3];
     /// let vec2 = vec.split_off(1);
     /// assert_eq!(vec, [1]);
     /// assert_eq!(vec2, [2, 3]);

library/core/src/mem/maybe_uninit.rs

@@ -392,7 +392,7 @@ pub fn write(&mut self, val: T) -> &mut T {
     /// use std::mem::MaybeUninit;
     ///
     /// let mut x = MaybeUninit::<Vec<u32>>::uninit();
-    /// unsafe { x.as_mut_ptr().write(vec![0,1,2]); }
+    /// unsafe { x.as_mut_ptr().write(vec![0, 1, 2]); }
     /// // Create a reference into the `MaybeUninit<T>`. This is okay because we initialized it.
     /// let x_vec = unsafe { &*x.as_ptr() };
     /// assert_eq!(x_vec.len(), 3);
@@ -429,7 +429,7 @@ pub const fn as_ptr(&self) -> *const T {
     /// use std::mem::MaybeUninit;
     ///
     /// let mut x = MaybeUninit::<Vec<u32>>::uninit();
-    /// unsafe { x.as_mut_ptr().write(vec![0,1,2]); }
+    /// unsafe { x.as_mut_ptr().write(vec![0, 1, 2]); }
     /// // Create a reference into the `MaybeUninit<Vec<u32>>`.
     /// // This is okay because we initialized it.
     /// let x_vec = unsafe { &mut *x.as_mut_ptr() };
@@ -565,7 +565,7 @@ pub unsafe fn assume_init(self) -> T {
     /// use std::mem::MaybeUninit;
     ///
     /// let mut x = MaybeUninit::<Option<Vec<u32>>>::uninit();
-    /// x.write(Some(vec![0,1,2]));
+    /// x.write(Some(vec![0, 1, 2]));
     /// let x1 = unsafe { x.assume_init_read() };
     /// let x2 = unsafe { x.assume_init_read() };
     /// // We now created two copies of the same vector, leading to a double-free ⚠️ when

library/core/src/ops/index.rs

@@ -79,7 +79,7 @@ pub trait Index<Idx: ?Sized> {
 /// each can be indexed mutably and immutably.
 ///
 /// ```
-/// use std::ops::{Index,IndexMut};
+/// use std::ops::{Index, IndexMut};
 ///
 /// #[derive(Debug)]
 /// enum Side {

library/core/src/slice/mod.rs

@@ -1958,10 +1958,10 @@ pub fn binary_search_by<'a, F>(&'a self, mut f: F) -> Result<usize, usize>
     ///          (1, 2), (2, 3), (4, 5), (5, 8), (3, 13),
     ///          (1, 21), (2, 34), (4, 55)];
     ///
-    /// assert_eq!(s.binary_search_by_key(&13, |&(a,b)| b),  Ok(9));
-    /// assert_eq!(s.binary_search_by_key(&4, |&(a,b)| b),   Err(7));
-    /// assert_eq!(s.binary_search_by_key(&100, |&(a,b)| b), Err(13));
-    /// let r = s.binary_search_by_key(&1, |&(a,b)| b);
+    /// assert_eq!(s.binary_search_by_key(&13, |&(a, b)| b),  Ok(9));
+    /// assert_eq!(s.binary_search_by_key(&4, |&(a, b)| b),   Err(7));
+    /// assert_eq!(s.binary_search_by_key(&100, |&(a, b)| b), Err(13));
+    /// let r = s.binary_search_by_key(&1, |&(a, b)| b);
     /// assert!(match r { Ok(1..=4) => true, _ => false, });
     /// ```
     #[stable(feature = "slice_binary_search_by_key", since = "1.10.0")]