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

   1 // run-rustfix
   2 #![warn(clippy::explicit_write)]
   3 #![allow(unused_imports)]
   4 #![allow(clippy::uninlined_format_args)]
   5
   6 fn stdout() -> String {
   7     String::new()
   8 }
   9
  10 fn stderr() -> String {
  11     String::new()
  12 }
  13
  14 macro_rules! one {
  15     () => {
  16         1
  17     };
  18 }
  19
  20 fn main() {
  21     // these should warn
  22     {
  23         use std::io::Write;
  24         print!("test");
  25         eprint!("test");
  26         println!("test");
  27         eprintln!("test");
  28         print!("test");
  29         eprint!("test");
  30
  31         // including newlines
  32         println!("test\ntest");
  33         eprintln!("test\ntest");
  34
  35         let value = 1;
  36         eprintln!("with {}", value);
  37         eprintln!("with {} {}", 2, value);
  38         eprintln!("with {value}");
  39         eprintln!("macro arg {}", one!());
  40         let width = 2;
  41         eprintln!("{:w$}", value, w = width);
  42     }
  43     // these should not warn, different destination
  44     {
  45         use std::fmt::Write;
  46         let mut s = String::new();
  47         write!(s, "test").unwrap();
  48         write!(s, "test").unwrap();
  49         writeln!(s, "test").unwrap();
  50         writeln!(s, "test").unwrap();
  51         s.write_fmt(format_args!("test")).unwrap();
  52         s.write_fmt(format_args!("test")).unwrap();
  53         write!(stdout(), "test").unwrap();
  54         write!(stderr(), "test").unwrap();
  55         writeln!(stdout(), "test").unwrap();
  56         writeln!(stderr(), "test").unwrap();
  57         stdout().write_fmt(format_args!("test")).unwrap();
  58         stderr().write_fmt(format_args!("test")).unwrap();
  59     }
  60     // these should not warn, no unwrap
  61     {
  62         use std::io::Write;
  63         std::io::stdout().write_fmt(format_args!("test")).expect("no stdout");
  64         std::io::stderr().write_fmt(format_args!("test")).expect("no stderr");
  65     }
  66 }