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, 6 insertions, 6 deletions

diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
index 3fa965d08e6..6005270a75f 100644
--- a/library/std/src/io/mod.rs
+++ b/library/std/src/io/mod.rs
@@ -91,7 +91,7 @@
 //!     // read a line into buffer
 //!     reader.read_line(&mut buffer)?;
 //!
-//!     println!("{}", buffer);
+//!     println!("{buffer}");
 //!     Ok(())
 //! }
 //! ```
@@ -1035,7 +1035,7 @@ pub trait Read {
 /// fn main() -> io::Result<()> {
 ///     let stdin = io::read_to_string(io::stdin())?;
 ///     println!("Stdin was:");
-///     println!("{}", stdin);
+///     println!("{stdin}");
 ///     Ok(())
 /// }
 /// ```
@@ -1761,7 +1761,7 @@ pub trait Seek {
     ///     .open("foo.txt").unwrap();
     ///
     /// let hello = "Hello!\n";
-    /// write!(f, "{}", hello).unwrap();
+    /// write!(f, "{hello}").unwrap();
     /// f.rewind().unwrap();
     ///
     /// let mut buf = String::new();
@@ -1804,7 +1804,7 @@ pub trait Seek {
     ///     let mut f = File::open("foo.txt")?;
     ///
     ///     let len = f.stream_len()?;
-    ///     println!("The file is currently {} bytes long", len);
+    ///     println!("The file is currently {len} bytes long");
     ///     Ok(())
     /// }
     /// ```
@@ -1988,7 +1988,7 @@ pub trait BufRead: Read {
     /// let buffer = stdin.fill_buf().unwrap();
     ///
     /// // work with buffer
-    /// println!("{:?}", buffer);
+    /// println!("{buffer:?}");
     ///
     /// // ensure the bytes we worked with aren't returned again later
     /// let length = buffer.len();
@@ -2042,7 +2042,7 @@ pub trait BufRead: Read {
     ///     let mut line = String::new();
     ///     stdin.read_line(&mut line).unwrap();
     ///     // work with line
-    ///     println!("{:?}", line);
+    ///     println!("{line:?}");
     /// }
     /// ```
     #[unstable(feature = "buf_read_has_data_left", reason = "recently added", issue = "86423")]