Auto merge of #64981 - tmandry:rollup-slfkhay, r=tmandry

Rollup of 11 pull requests

Successful merges:

 - #64649 (Avoid ICE on return outside of fn with literal array)
 - #64722 (Make all alt builders produce parallel-enabled compilers)
 - #64801 (Avoid `chain()` in `find_constraint_paths_between_regions()`.)
 - #64805 (Still more `ObligationForest` improvements.)
 - #64840 (SelfProfiler API refactoring and part one of event review)
 - #64885 (use try_fold instead of try_for_each to reduce compile time)
 - #64942 (Fix clippy warnings)
 - #64952 (Update cargo.)
 - #64974 (Fix zebra-striping in generic dataflow visualization)
 - #64978 (Fully clear `HandlerInner` in `Handler::reset_err_count`)
 - #64979 (Update books)

Failed merges:

 - #64959 (syntax: improve parameter without type suggestions)

r? @ghost

1 files changed, 10 insertions, 11 deletions

diff --git a/src/libserialize/json.rs b/src/libserialize/json.rs
index d0007074a82..d2e360f5e20 100644
--- a/src/libserialize/json.rs
+++ b/src/libserialize/json.rs
@@ -1053,12 +1053,12 @@ impl Json {
     /// a value associated with the provided key is found. If no value is found
     /// or the Json value is not an Object, returns `None`.
     pub fn search(&self, key: &str) -> Option<&Json> {
-        match self {
-            &Json::Object(ref map) => {
+        match *self {
+            Json::Object(ref map) => {
                 match map.get(key) {
                     Some(json_value) => Some(json_value),
                     None => {
-                        for (_, v) in map {
+                        for v in map.values() {
                             match v.search(key) {
                                 x if x.is_some() => return x,
                                 _ => ()
@@ -1487,12 +1487,12 @@ impl<T: Iterator<Item=char>> Parser<T> {
     }
 
     fn parse_number(&mut self) -> JsonEvent {
-        let mut neg = false;
-
-        if self.ch_is('-') {
+        let neg = if self.ch_is('-') {
             self.bump();
-            neg = true;
-        }
+            true
+        } else {
+            false
+        };
 
         let res = match self.parse_u64() {
             Ok(res) => res,
@@ -2162,10 +2162,9 @@ impl crate::Decoder for Decoder {
         let s = self.read_str()?;
         {
             let mut it = s.chars();
-            match (it.next(), it.next()) {
+            if let (Some(c), None) = (it.next(), it.next()) {
                 // exactly one character
-                (Some(c), None) => return Ok(c),
-                _ => ()
+                return Ok(c);
             }
         }
         Err(ExpectedError("single character string".to_owned(), s.to_string()))