Apply x clippy --fix and x fmt on Rustc

compiler/rustc_data_structures/src/graph/dominators/mod.rs

@@ -93,7 +93,7 @@ fn dominators_impl<G: ControlFlowGraph>(graph: &G) -> Inner<G::Node> {
     // These are all done here rather than through one of the 'standard'
     // graph traversals to help make this fast.
     'recurse: while let Some(frame) = stack.last_mut() {
-        while let Some(successor) = frame.iter.next() {
+        for successor in frame.iter.by_ref() {
             if real_to_pre_order[successor].is_none() {
                 let pre_order_idx = pre_order_to_real.push(successor);
                 real_to_pre_order[successor] = Some(pre_order_idx);

compiler/rustc_data_structures/src/graph/iterate/mod.rs

@@ -48,7 +48,7 @@ fn post_order_walk<G: DirectedGraph + Successors>(
         let node = frame.node;
         visited[node] = true;
 
-        while let Some(successor) = frame.iter.next() {
+        for successor in frame.iter.by_ref() {
             if !visited[successor] {
                 stack.push(PostOrderFrame { node: successor, iter: graph.successors(successor) });
                 continue 'recurse;
@@ -112,7 +112,7 @@ where
     /// This is equivalent to just invoke `next` repeatedly until
     /// you get a `None` result.
     pub fn complete_search(&mut self) {
-        while let Some(_) = self.next() {}
+        for _ in self.by_ref() {}
     }
 
     /// Returns true if node has been visited thus far.

compiler/rustc_data_structures/src/graph/scc/mod.rs

@@ -40,7 +40,7 @@ pub struct SccData<S: Idx> {
 }
 
 impl<N: Idx, S: Idx + Ord> Sccs<N, S> {
-    pub fn new(graph: &(impl DirectedGraph<Node = N> + Successors)) -> Self {
+    pub fn new(graph: &impl Successors<Node = N>) -> Self {
         SccsConstruction::construct(graph)
     }
 

compiler/rustc_data_structures/src/profiling.rs

@@ -562,7 +562,7 @@ impl SelfProfiler {
         // ASLR is disabled and the heap is otherwise deterministic.
         let pid: u32 = process::id();
         let filename = format!("{crate_name}-{pid:07}.rustc_profile");
-        let path = output_directory.join(&filename);
+        let path = output_directory.join(filename);
         let profiler =
             Profiler::with_counter(&path, measureme::counters::Counter::by_name(counter_name)?)?;
 

compiler/rustc_data_structures/src/sorted_map.rs

@@ -125,13 +125,13 @@ impl<K: Ord, V> SortedMap<K, V> {
 
     /// Iterate over the keys, sorted
     #[inline]
-    pub fn keys(&self) -> impl Iterator<Item = &K> + ExactSizeIterator + DoubleEndedIterator {
+    pub fn keys(&self) -> impl ExactSizeIterator<Item = &K> + DoubleEndedIterator {
         self.data.iter().map(|(k, _)| k)
     }
 
     /// Iterate over values, sorted by key
     #[inline]
-    pub fn values(&self) -> impl Iterator<Item = &V> + ExactSizeIterator + DoubleEndedIterator {
+    pub fn values(&self) -> impl ExactSizeIterator<Item = &V> + DoubleEndedIterator {
         self.data.iter().map(|(_, v)| v)
     }
 

compiler/rustc_data_structures/src/sync/lock.rs

@@ -69,7 +69,7 @@ mod maybe_sync {
             match self.mode {
                 Mode::NoSync => {
                     let cell = unsafe { &self.lock.mode_union.no_sync };
-                    debug_assert_eq!(cell.get(), true);
+                    debug_assert!(cell.get());
                     cell.set(false);
                 }
                 // SAFETY (unlock): We know that the lock is locked as this type is a proof of that.

compiler/rustc_parse_format/src/lib.rs

@@ -286,13 +286,11 @@ impl<'a> Iterator for Parser<'a> {
                                     lbrace_byte_pos.to(InnerOffset(rbrace_byte_pos.0 + width)),
                                 );
                             }
-                        } else {
-                            if let Some(&(_, maybe)) = self.cur.peek() {
-                                match maybe {
-                                    '?' => self.suggest_format_debug(),
-                                    '<' | '^' | '>' => self.suggest_format_align(maybe),
-                                    _ => self.suggest_positional_arg_instead_of_captured_arg(arg),
-                                }
+                        } else if let Some(&(_, maybe)) = self.cur.peek() {
+                            match maybe {
+                                '?' => self.suggest_format_debug(),
+                                '<' | '^' | '>' => self.suggest_format_align(maybe),
+                                _ => self.suggest_positional_arg_instead_of_captured_arg(arg),
                             }
                         }
                         Some(NextArgument(Box::new(arg)))
@@ -1028,7 +1026,7 @@ fn find_width_map_from_snippet(
                     if next_c == '{' {
                         // consume up to 6 hexanumeric chars
                         let digits_len =
-                            s.clone().take(6).take_while(|(_, c)| c.is_digit(16)).count();
+                            s.clone().take(6).take_while(|(_, c)| c.is_ascii_hexdigit()).count();
 
                         let len_utf8 = s
                             .as_str()
@@ -1047,14 +1045,14 @@ fn find_width_map_from_snippet(
                         width += required_skips + 2;
 
                         s.nth(digits_len);
-                    } else if next_c.is_digit(16) {
+                    } else if next_c.is_ascii_hexdigit() {
                         width += 1;
 
                         // We suggest adding `{` and `}` when appropriate, accept it here as if
                         // it were correct
                         let mut i = 0; // consume up to 6 hexanumeric chars
                         while let (Some((_, c)), _) = (s.next(), i < 6) {
-                            if c.is_digit(16) {
+                            if c.is_ascii_hexdigit() {
                                 width += 1;
                             } else {
                                 break;

compiler/rustc_serialize/src/serialize.rs

@@ -252,7 +252,7 @@ impl<S: Encoder> Encodable<S> for () {
 }
 
 impl<D: Decoder> Decodable<D> for () {
-    fn decode(_: &mut D) -> () {}
+    fn decode(_: &mut D) {}
 }
 
 impl<S: Encoder, T> Encodable<S> for PhantomData<T> {

compiler/stable_mir/src/mir/pretty.rs

@@ -156,7 +156,7 @@ fn pretty_terminator<W: Write>(writer: &mut W, terminator: &TerminatorKind) -> i
 
 fn pretty_terminator_head<W: Write>(writer: &mut W, terminator: &TerminatorKind) -> io::Result<()> {
     use self::TerminatorKind::*;
-    const INDENT: &'static str = "        ";
+    const INDENT: &str = "        ";
     match terminator {
         Goto { .. } => write!(writer, "{INDENT}goto"),
         SwitchInt { discr, .. } => {
@@ -315,7 +315,7 @@ fn pretty_operand(operand: &Operand) -> String {
 }
 
 fn pretty_const(literal: &Const) -> String {
-    with(|cx| cx.const_pretty(&literal))
+    with(|cx| cx.const_pretty(literal))
 }
 
 fn pretty_rvalue<W: Write>(writer: &mut W, rval: &Rvalue) -> io::Result<()> {

compiler/stable_mir/src/ty.rs

@@ -526,7 +526,7 @@ pub enum IntTy {
 impl IntTy {
     pub fn num_bytes(self) -> usize {
         match self {
-            IntTy::Isize => crate::target::MachineInfo::target_pointer_width().bytes().into(),
+            IntTy::Isize => crate::target::MachineInfo::target_pointer_width().bytes(),
             IntTy::I8 => 1,
             IntTy::I16 => 2,
             IntTy::I32 => 4,
@@ -549,7 +549,7 @@ pub enum UintTy {
 impl UintTy {
     pub fn num_bytes(self) -> usize {
         match self {
-            UintTy::Usize => crate::target::MachineInfo::target_pointer_width().bytes().into(),
+            UintTy::Usize => crate::target::MachineInfo::target_pointer_width().bytes(),
             UintTy::U8 => 1,
             UintTy::U16 => 2,
             UintTy::U32 => 4,
@@ -1185,7 +1185,7 @@ impl Allocation {
         match self.read_int()? {
             0 => Ok(false),
             1 => Ok(true),
-            val @ _ => Err(error!("Unexpected value for bool: `{val}`")),
+            val => Err(error!("Unexpected value for bool: `{val}`")),
         }
     }
 

library/proc_macro/src/bridge/fxhash.rs

@@ -69,7 +69,7 @@ impl Hasher for FxHasher {
             hash.add_to_hash(u16::from_ne_bytes(bytes[..2].try_into().unwrap()) as usize);
             bytes = &bytes[2..];
         }
-        if (size_of::<usize>() > 1) && bytes.len() >= 1 {
+        if (size_of::<usize>() > 1) && !bytes.is_empty() {
             hash.add_to_hash(bytes[0] as usize);
         }
         self.hash = hash.hash;

library/proc_macro/src/bridge/rpc.rs

@@ -264,9 +264,9 @@ impl From<Box<dyn Any + Send>> for PanicMessage {
     }
 }
 
-impl Into<Box<dyn Any + Send>> for PanicMessage {
-    fn into(self) -> Box<dyn Any + Send> {
-        match self {
+impl From<PanicMessage> for Box<dyn Any + Send> {
+    fn from(val: PanicMessage) -> Self {
+        match val {
             PanicMessage::StaticStr(s) => Box::new(s),
             PanicMessage::String(s) => Box::new(s),
             PanicMessage::Unknown => {

library/test/src/cli.rs

@@ -200,7 +200,7 @@ Test Attributes:
 pub fn parse_opts(args: &[String]) -> Option<OptRes> {
     // Parse matches.
     let opts = optgroups();
-    let binary = args.get(0).map(|c| &**c).unwrap_or("...");
+    let binary = args.first().map(|c| &**c).unwrap_or("...");
     let args = args.get(1..).unwrap_or(args);
     let matches = match opts.parse(args) {
         Ok(m) => m,

library/test/src/term/terminfo/parm.rs

@@ -524,7 +524,7 @@ fn format(val: Param, op: FormatOp, flags: Flags) -> Result<Vec<u8>, String> {
         } else {
             let mut s_ = Vec::with_capacity(flags.width);
             s_.extend(repeat(b' ').take(n));
-            s_.extend(s.into_iter());
+            s_.extend(s);
             s = s_;
         }
     }