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).

6 files changed, 11 insertions, 11 deletions

diff --git a/library/std/src/sys/unix/net.rs b/library/std/src/sys/unix/net.rs
index 61c15ecd85d..e6fd9a0c827 100644
--- a/library/std/src/sys/unix/net.rs
+++ b/library/std/src/sys/unix/net.rs
@@ -54,7 +54,7 @@ pub fn cvt_gai(err: c_int) -> io::Result<()> {
 
     Err(io::Error::new(
         io::ErrorKind::Uncategorized,
-        &format!("failed to lookup address information: {}", detail)[..],
+        &format!("failed to lookup address information: {detail}")[..],
     ))
 }
 
diff --git a/library/std/src/sys/unix/os_str/tests.rs b/library/std/src/sys/unix/os_str/tests.rs
index 37967378155..213277f01f2 100644
--- a/library/std/src/sys/unix/os_str/tests.rs
+++ b/library/std/src/sys/unix/os_str/tests.rs
@@ -4,7 +4,7 @@ use super::*;
 fn slice_debug_output() {
     let input = Slice::from_u8_slice(b"\xF0hello,\tworld");
     let expected = r#""\xF0hello,\tworld""#;
-    let output = format!("{:?}", input);
+    let output = format!("{input:?}");
 
     assert_eq!(output, expected);
 }
diff --git a/library/std/src/sys/unix/process/process_fuchsia.rs b/library/std/src/sys/unix/process/process_fuchsia.rs
index 09bfd9680f5..e3347ab12a7 100644
--- a/library/std/src/sys/unix/process/process_fuchsia.rs
+++ b/library/std/src/sys/unix/process/process_fuchsia.rs
@@ -211,7 +211,7 @@ impl Process {
                     return Ok(None);
                 }
                 _ => {
-                    panic!("Failed to wait on process handle: {}", status);
+                    panic!("Failed to wait on process handle: {status}");
                 }
             }
             zx_cvt(zx_object_get_info(
diff --git a/library/std/src/sys/unix/process/process_unix.rs b/library/std/src/sys/unix/process/process_unix.rs
index 07a0339c066..9c477e5addc 100644
--- a/library/std/src/sys/unix/process/process_unix.rs
+++ b/library/std/src/sys/unix/process/process_unix.rs
@@ -120,7 +120,7 @@ impl Command {
                 Err(ref e) if e.kind() == ErrorKind::Interrupted => {}
                 Err(e) => {
                     assert!(p.wait().is_ok(), "wait() should either return Ok or panic");
-                    panic!("the CLOEXEC pipe failed: {:?}", e)
+                    panic!("the CLOEXEC pipe failed: {e:?}")
                 }
                 Ok(..) => {
                     // pipe I/O up to PIPE_BUF bytes should be atomic
@@ -682,15 +682,15 @@ impl From<c_int> for ExitStatus {
 impl fmt::Display for ExitStatus {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         if let Some(code) = self.code() {
-            write!(f, "exit status: {}", code)
+            write!(f, "exit status: {code}")
         } else if let Some(signal) = self.signal() {
             if self.core_dumped() {
-                write!(f, "signal: {} (core dumped)", signal)
+                write!(f, "signal: {signal} (core dumped)")
             } else {
-                write!(f, "signal: {}", signal)
+                write!(f, "signal: {signal}")
             }
         } else if let Some(signal) = self.stopped_signal() {
-            write!(f, "stopped (not terminated) by signal: {}", signal)
+            write!(f, "stopped (not terminated) by signal: {signal}")
         } else if self.continued() {
             write!(f, "continued (WIFCONTINUED)")
         } else {
diff --git a/library/std/src/sys/unix/process/process_vxworks.rs b/library/std/src/sys/unix/process/process_vxworks.rs
index 56ed6cfeb6a..016bc20ec0a 100644
--- a/library/std/src/sys/unix/process/process_vxworks.rs
+++ b/library/std/src/sys/unix/process/process_vxworks.rs
@@ -239,10 +239,10 @@ impl From<c_int> for ExitStatus {
 impl fmt::Display for ExitStatus {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         if let Some(code) = self.code() {
-            write!(f, "exit code: {}", code)
+            write!(f, "exit code: {code}")
         } else {
             let signal = self.signal().unwrap();
-            write!(f, "signal: {}", signal)
+            write!(f, "signal: {signal}")
         }
     }
 }
diff --git a/library/std/src/sys/unix/rand.rs b/library/std/src/sys/unix/rand.rs
index 7a3f6b0d95a..17e8efbe097 100644
--- a/library/std/src/sys/unix/rand.rs
+++ b/library/std/src/sys/unix/rand.rs
@@ -82,7 +82,7 @@ mod imp {
                 } else if err == libc::EAGAIN {
                     return false;
                 } else {
-                    panic!("unexpected getrandom error: {}", err);
+                    panic!("unexpected getrandom error: {err}");
                 }
             } else {
                 read += result as usize;