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#![warn(clippy::explicit_write)]
#![allow(unused_imports)]
#![allow(clippy::uninlined_format_args)]
fn stdout() -> String {
String::new()
}
fn stderr() -> String {
String::new()
}
macro_rules! one {
() => {
1
};
}
fn main() {
// these should warn
{
use std::io::Write;
write!(std::io::stdout(), "test").unwrap();
write!(std::io::stderr(), "test").unwrap();
writeln!(std::io::stdout(), "test").unwrap();
writeln!(std::io::stderr(), "test").unwrap();
std::io::stdout().write_fmt(format_args!("test")).unwrap();
std::io::stderr().write_fmt(format_args!("test")).unwrap();
// including newlines
writeln!(std::io::stdout(), "test\ntest").unwrap();
writeln!(std::io::stderr(), "test\ntest").unwrap();
let value = 1;
writeln!(std::io::stderr(), "with {}", value).unwrap();
writeln!(std::io::stderr(), "with {} {}", 2, value).unwrap();
writeln!(std::io::stderr(), "with {value}").unwrap();
writeln!(std::io::stderr(), "macro arg {}", one!()).unwrap();
let width = 2;
writeln!(std::io::stderr(), "{:w$}", value, w = width).unwrap();
}
// these should not warn, different destination
{
use std::fmt::Write;
let mut s = String::new();
write!(s, "test").unwrap();
write!(s, "test").unwrap();
writeln!(s, "test").unwrap();
writeln!(s, "test").unwrap();
s.write_fmt(format_args!("test")).unwrap();
s.write_fmt(format_args!("test")).unwrap();
write!(stdout(), "test").unwrap();
write!(stderr(), "test").unwrap();
writeln!(stdout(), "test").unwrap();
writeln!(stderr(), "test").unwrap();
stdout().write_fmt(format_args!("test")).unwrap();
stderr().write_fmt(format_args!("test")).unwrap();
}
// these should not warn, no unwrap
{
use std::io::Write;
std::io::stdout().write_fmt(format_args!("test")).expect("no stdout");
std::io::stderr().write_fmt(format_args!("test")).expect("no stderr");
}
}
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