5 files changed, 6 insertions, 6 deletions
diff --git a/library/std/src/sys_common/backtrace.rs b/library/std/src/sys_common/backtrace.rs
index b0b55592f6f..31164afdc7b 100644
--- a/library/std/src/sys_common/backtrace.rs
+++ b/library/std/src/sys_common/backtrace.rs
@@ -174,7 +174,7 @@ pub fn output_filename(
         if let Some(cwd) = cwd {
             if let Ok(stripped) = file.strip_prefix(&cwd) {
                 if let Some(s) = stripped.to_str() {
-                    return write!(fmt, ".{}{}", path::MAIN_SEPARATOR, s);
+                    return write!(fmt, ".{}{s}", path::MAIN_SEPARATOR);
                 }
             }
         }
diff --git a/library/std/src/sys_common/net/tests.rs b/library/std/src/sys_common/net/tests.rs
index 7d45621e09a..ac75d9ebfc8 100644
--- a/library/std/src/sys_common/net/tests.rs
+++ b/library/std/src/sys_common/net/tests.rs
@@ -6,7 +6,7 @@ fn no_lookup_host_duplicates() {
     let mut addrs = HashMap::new();
     let lh = match LookupHost::try_from(("localhost", 0)) {
         Ok(lh) => lh,
-        Err(e) => panic!("couldn't resolve `localhost': {}", e),
+        Err(e) => panic!("couldn't resolve `localhost': {e}"),
     };
     for sa in lh {
         *addrs.entry(sa).or_insert(0) += 1;
diff --git a/library/std/src/sys_common/thread_parker/generic.rs b/library/std/src/sys_common/thread_parker/generic.rs
index d99e901bb5f..ffb61200e15 100644
--- a/library/std/src/sys_common/thread_parker/generic.rs
+++ b/library/std/src/sys_common/thread_parker/generic.rs
@@ -84,7 +84,7 @@ impl Parker {
         match self.state.swap(EMPTY, SeqCst) {
             NOTIFIED => {} // got a notification, hurray!
             PARKED => {}   // no notification, alas
-            n => panic!("inconsistent park_timeout state: {}", n),
+            n => panic!("inconsistent park_timeout state: {n}"),
         }
     }
 
diff --git a/library/std/src/sys_common/wtf8.rs b/library/std/src/sys_common/wtf8.rs
index 7a6e6246357..10ef6662115 100644
--- a/library/std/src/sys_common/wtf8.rs
+++ b/library/std/src/sys_common/wtf8.rs
@@ -830,7 +830,7 @@ pub unsafe fn slice_unchecked(s: &Wtf8, begin: usize, end: usize) -> &Wtf8 {
 #[inline(never)]
 pub fn slice_error_fail(s: &Wtf8, begin: usize, end: usize) -> ! {
     assert!(begin <= end);
-    panic!("index {} and/or {} in `{:?}` do not lie on character boundary", begin, end, s);
+    panic!("index {begin} and/or {end} in `{s:?}` do not lie on character boundary");
 }
 
 /// Iterator for the code points of a WTF-8 string.
diff --git a/library/std/src/sys_common/wtf8/tests.rs b/library/std/src/sys_common/wtf8/tests.rs
index 1bafbaa6939..931996791fb 100644
--- a/library/std/src/sys_common/wtf8/tests.rs
+++ b/library/std/src/sys_common/wtf8/tests.rs
@@ -266,7 +266,7 @@ fn wtf8buf_extend() {
 fn wtf8buf_show() {
     let mut string = Wtf8Buf::from_str("a\té \u{7f}💩\r");
     string.push(CodePoint::from_u32(0xD800).unwrap());
-    assert_eq!(format!("{:?}", string), "\"a\\té \\u{7f}\u{1f4a9}\\r\\u{d800}\"");
+    assert_eq!(format!("{string:?}"), "\"a\\té \\u{7f}\u{1f4a9}\\r\\u{d800}\"");
 }
 
 #[test]
@@ -278,7 +278,7 @@ fn wtf8buf_as_slice() {
 fn wtf8buf_show_str() {
     let text = "a\té 💩\r";
     let string = Wtf8Buf::from_str(text);
-    assert_eq!(format!("{:?}", text), format!("{:?}", string));
+    assert_eq!(format!("{text:?}"), format!("{string:?}"));
 }
 
 #[test]