Rollup merge of #126632 - Vonr:fix/moving-closure-formatting-v2, r=Nilstrieb

Replace `move||` with `move ||`

Edit from #126631 to revert changes in `tests/ui`.

There are 18 instances of `move||` across 6 files in the repo:
- `compiler/rustc_hir_typeck/src/typeck_root_ctxt.rs`
- `library/core/src/sync/atomic.rs`
- `library/std/src/sync/condvar.rs`
- `library/std/src/sync/mpsc/mod.rs`
- `library/std/src/sync/barrier.rs`
- `library/std/src/thread/local.rs`

I have replaced all such instances with `move ||` instead as it better adheres to modern formatting standards.

Ideally, we would have this automated by rustfmt or some other tool, but I do not have the time to implement such a feature or tool.
Nonetheless, I would encourage any effort invested into such a tool or feature.

compiler/rustc_hir_typeck/src/typeck_root_ctxt.rs

@@ -22,7 +22,7 @@ use std::ops::Deref;
 /// e.g. closures defined within the function. For example:
 /// ```ignore (illustrative)
 /// fn foo() {
-///     bar(move|| { ... })
+///     bar(move || { ... })
 /// }
 /// ```
 /// Here, the function `foo()` and the closure passed to

library/core/src/sync/atomic.rs

@@ -183,7 +183,7 @@
 //!
 //!     let spinlock_clone = Arc::clone(&spinlock);
 //!
-//!     let thread = thread::spawn(move|| {
+//!     let thread = thread::spawn(move || {
 //!         spinlock_clone.store(0, Ordering::Release);
 //!     });
 //!

library/std/src/sync/barrier.rs

@@ -20,7 +20,7 @@ use crate::sync::{Condvar, Mutex};
 ///     let c = Arc::clone(&barrier);
 ///     // The same messages will be printed together.
 ///     // You will NOT see any interleaving.
-///     handles.push(thread::spawn(move|| {
+///     handles.push(thread::spawn(move || {
 ///         println!("before wait");
 ///         c.wait();
 ///         println!("after wait");
@@ -115,7 +115,7 @@ impl Barrier {
     ///     let c = Arc::clone(&barrier);
     ///     // The same messages will be printed together.
     ///     // You will NOT see any interleaving.
-    ///     handles.push(thread::spawn(move|| {
+    ///     handles.push(thread::spawn(move || {
     ///         println!("before wait");
     ///         c.wait();
     ///         println!("after wait");

library/std/src/sync/condvar.rs

@@ -88,7 +88,7 @@ impl WaitTimeoutResult {
 /// let pair2 = Arc::clone(&pair);
 ///
 /// // Inside of our lock, spawn a new thread, and then wait for it to start.
-/// thread::spawn(move|| {
+/// thread::spawn(move || {
 ///     let (lock, cvar) = &*pair2;
 ///     let mut started = lock.lock().unwrap();
 ///     *started = true;
@@ -166,7 +166,7 @@ impl Condvar {
     /// let pair = Arc::new((Mutex::new(false), Condvar::new()));
     /// let pair2 = Arc::clone(&pair);
     ///
-    /// thread::spawn(move|| {
+    /// thread::spawn(move || {
     ///     let (lock, cvar) = &*pair2;
     ///     let mut started = lock.lock().unwrap();
     ///     *started = true;
@@ -221,7 +221,7 @@ impl Condvar {
     /// let pair = Arc::new((Mutex::new(true), Condvar::new()));
     /// let pair2 = Arc::clone(&pair);
     ///
-    /// thread::spawn(move|| {
+    /// thread::spawn(move || {
     ///     let (lock, cvar) = &*pair2;
     ///     let mut pending = lock.lock().unwrap();
     ///     *pending = false;
@@ -280,7 +280,7 @@ impl Condvar {
     /// let pair = Arc::new((Mutex::new(false), Condvar::new()));
     /// let pair2 = Arc::clone(&pair);
     ///
-    /// thread::spawn(move|| {
+    /// thread::spawn(move || {
     ///     let (lock, cvar) = &*pair2;
     ///     let mut started = lock.lock().unwrap();
     ///     *started = true;
@@ -352,7 +352,7 @@ impl Condvar {
     /// let pair = Arc::new((Mutex::new(false), Condvar::new()));
     /// let pair2 = Arc::clone(&pair);
     ///
-    /// thread::spawn(move|| {
+    /// thread::spawn(move || {
     ///     let (lock, cvar) = &*pair2;
     ///     let mut started = lock.lock().unwrap();
     ///     *started = true;
@@ -420,7 +420,7 @@ impl Condvar {
     /// let pair = Arc::new((Mutex::new(true), Condvar::new()));
     /// let pair2 = Arc::clone(&pair);
     ///
-    /// thread::spawn(move|| {
+    /// thread::spawn(move || {
     ///     let (lock, cvar) = &*pair2;
     ///     let mut pending = lock.lock().unwrap();
     ///     *pending = false;
@@ -484,7 +484,7 @@ impl Condvar {
     /// let pair = Arc::new((Mutex::new(false), Condvar::new()));
     /// let pair2 = Arc::clone(&pair);
     ///
-    /// thread::spawn(move|| {
+    /// thread::spawn(move || {
     ///     let (lock, cvar) = &*pair2;
     ///     let mut started = lock.lock().unwrap();
     ///     *started = true;
@@ -524,7 +524,7 @@ impl Condvar {
     /// let pair = Arc::new((Mutex::new(false), Condvar::new()));
     /// let pair2 = Arc::clone(&pair);
     ///
-    /// thread::spawn(move|| {
+    /// thread::spawn(move || {
     ///     let (lock, cvar) = &*pair2;
     ///     let mut started = lock.lock().unwrap();
     ///     *started = true;

library/std/src/sync/mpsc/mod.rs

@@ -51,7 +51,7 @@
 //!
 //! // Create a simple streaming channel
 //! let (tx, rx) = channel();
-//! thread::spawn(move|| {
+//! thread::spawn(move || {
 //!     tx.send(10).unwrap();
 //! });
 //! assert_eq!(rx.recv().unwrap(), 10);
@@ -69,7 +69,7 @@
 //! let (tx, rx) = channel();
 //! for i in 0..10 {
 //!     let tx = tx.clone();
-//!     thread::spawn(move|| {
+//!     thread::spawn(move || {
 //!         tx.send(i).unwrap();
 //!     });
 //! }
@@ -99,7 +99,7 @@
 //! use std::sync::mpsc::sync_channel;
 //!
 //! let (tx, rx) = sync_channel::<i32>(0);
-//! thread::spawn(move|| {
+//! thread::spawn(move || {
 //!     // This will wait for the parent thread to start receiving
 //!     tx.send(53).unwrap();
 //! });
@@ -510,7 +510,7 @@ pub enum TrySendError<T> {
 /// let (sender, receiver) = channel();
 ///
 /// // Spawn off an expensive computation
-/// thread::spawn(move|| {
+/// thread::spawn(move || {
 /// #   fn expensive_computation() {}
 ///     sender.send(expensive_computation()).unwrap();
 /// });
@@ -561,7 +561,7 @@ pub fn channel<T>() -> (Sender<T>, Receiver<T>) {
 /// // this returns immediately
 /// sender.send(1).unwrap();
 ///
-/// thread::spawn(move|| {
+/// thread::spawn(move || {
 ///     // this will block until the previous message has been received
 ///     sender.send(2).unwrap();
 /// });

library/std/src/thread/local.rs

@@ -62,7 +62,7 @@ use crate::fmt;
 /// FOO.set(2);
 ///
 /// // each thread starts out with the initial value of 1
-/// let t = thread::spawn(move|| {
+/// let t = thread::spawn(move || {
 ///     assert_eq!(FOO.get(), 1);
 ///     FOO.set(3);
 /// });