Rollup merge of #76888 - matthiaskrgr:clippy_single_match_2, r=Dylan-DPC

use if let instead of single match arm expressions

use if let instead of single match arm expressions to compact code and reduce nesting (clippy::single_match)

compiler/rustc_parse_format/src/lib.rs

@@ -525,12 +525,9 @@ impl<'a> Parser<'a> {
 
         // fill character
         if let Some(&(_, c)) = self.cur.peek() {
-            match self.cur.clone().nth(1) {
-                Some((_, '>' | '<' | '^')) => {
-                    spec.fill = Some(c);
-                    self.cur.next();
-                }
-                _ => {}
+            if let Some((_, '>' | '<' | '^')) = self.cur.clone().nth(1) {
+                spec.fill = Some(c);
+                self.cur.next();
             }
         }
         // Alignment