src/tools/clippy/tests/ui/explicit_write.fixed

   1 // run-rustfix
   2 #![allow(unused_imports)]
   3 #![warn(clippy::explicit_write)]
   4
   5 fn stdout() -> String {
   6     String::new()
   7 }
   8
   9 fn stderr() -> String {
  10     String::new()
  11 }
  12
  13 macro_rules! one {
  14     () => {
  15         1
  16     };
  17 }
  18
  19 fn main() {
  20     // these should warn
  21     {
  22         use std::io::Write;
  23         print!("test");
  24         eprint!("test");
  25         println!("test");
  26         eprintln!("test");
  27         print!("test");
  28         eprint!("test");
  29
  30         // including newlines
  31         println!("test\ntest");
  32         eprintln!("test\ntest");
  33
  34         let value = 1;
  35         eprintln!("with {}", value);
  36         eprintln!("with {} {}", 2, value);
  37         eprintln!("with {value}");
  38         eprintln!("macro arg {}", one!());
  39         let width = 2;
  40         eprintln!("{:w$}", value, w = width);
  41     }
  42     // these should not warn, different destination
  43     {
  44         use std::fmt::Write;
  45         let mut s = String::new();
  46         write!(s, "test").unwrap();
  47         write!(s, "test").unwrap();
  48         writeln!(s, "test").unwrap();
  49         writeln!(s, "test").unwrap();
  50         s.write_fmt(format_args!("test")).unwrap();
  51         s.write_fmt(format_args!("test")).unwrap();
  52         write!(stdout(), "test").unwrap();
  53         write!(stderr(), "test").unwrap();
  54         writeln!(stdout(), "test").unwrap();
  55         writeln!(stderr(), "test").unwrap();
  56         stdout().write_fmt(format_args!("test")).unwrap();
  57         stderr().write_fmt(format_args!("test")).unwrap();
  58     }
  59     // these should not warn, no unwrap
  60     {
  61         use std::io::Write;
  62         std::io::stdout().write_fmt(format_args!("test")).expect("no stdout");
  63         std::io::stderr().write_fmt(format_args!("test")).expect("no stderr");
  64     }
  65 }