Use implicit capture syntax in format_args

This updates the standard library's documentation to use the new syntax. The
documentation is worthwhile to update as it should be more idiomatic
(particularly for features like this, which are nice for users to get acquainted
with). The general codebase is likely more hassle than benefit to update: it'll
hurt git blame, and generally updates can be done by folks updating the code if
(and when) that makes things more readable with the new format.

A few places in the compiler and library code are updated (mostly just due to
already having been done when this commit was first authored).

1 files changed, 5 insertions, 5 deletions

diff --git a/library/std/src/fs/tests.rs b/library/std/src/fs/tests.rs
index 16b8bf68242..88d87fc532e 100644
--- a/library/std/src/fs/tests.rs
+++ b/library/std/src/fs/tests.rs
@@ -30,7 +30,7 @@ macro_rules! check {
     ($e:expr) => {
         match $e {
             Ok(t) => t,
-            Err(e) => panic!("{} failed with: {}", stringify!($e), e),
+            Err(e) => panic!("{} failed with: {e}", stringify!($e)),
         }
     };
 }
@@ -470,7 +470,7 @@ fn file_test_directoryinfo_readdir() {
     check!(fs::create_dir(dir));
     let prefix = "foo";
     for n in 0..3 {
-        let f = dir.join(&format!("{}.txt", n));
+        let f = dir.join(&format!("{n}.txt"));
         let mut w = check!(File::create(&f));
         let msg_str = format!("{}{}", prefix, n.to_string());
         let msg = msg_str.as_bytes();
@@ -1329,7 +1329,7 @@ fn dir_entry_methods() {
                 assert!(file.file_type().unwrap().is_file());
                 assert!(file.metadata().unwrap().is_file());
             }
-            f => panic!("unknown file name: {:?}", f),
+            f => panic!("unknown file name: {f:?}"),
         }
     }
 }
@@ -1340,7 +1340,7 @@ fn dir_entry_debug() {
     File::create(&tmpdir.join("b")).unwrap();
     let mut read_dir = tmpdir.path().read_dir().unwrap();
     let dir_entry = read_dir.next().unwrap().unwrap();
-    let actual = format!("{:?}", dir_entry);
+    let actual = format!("{dir_entry:?}");
     let expected = format!("DirEntry({:?})", dir_entry.0.path());
     assert_eq!(actual, expected);
 }
@@ -1409,7 +1409,7 @@ fn metadata_access_times() {
                     || e1.kind() == ErrorKind::Unsupported
                         && e2.kind() == ErrorKind::Unsupported => {}
             (a, b) => {
-                panic!("creation time must be always supported or not supported: {:?} {:?}", a, b,)
+                panic!("creation time must be always supported or not supported: {a:?} {b:?}")
             }
         }
     }