47 lines
1.4 KiB
Rust
47 lines
1.4 KiB
Rust
#![warn(explicit_write)]
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fn stdout() -> String {
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String::new()
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}
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fn stderr() -> String {
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String::new()
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}
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fn main() {
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// these should warn
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{
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use std::io::Write;
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write!(std::io::stdout(), "test").unwrap();
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write!(std::io::stderr(), "test").unwrap();
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writeln!(std::io::stdout(), "test").unwrap();
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writeln!(std::io::stderr(), "test").unwrap();
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std::io::stdout().write_fmt(format_args!("test")).unwrap();
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std::io::stderr().write_fmt(format_args!("test")).unwrap();
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}
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// these should not warn, different destination
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{
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use std::fmt::Write;
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let mut s = String::new();
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write!(s, "test").unwrap();
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write!(s, "test").unwrap();
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writeln!(s, "test").unwrap();
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writeln!(s, "test").unwrap();
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s.write_fmt(format_args!("test")).unwrap();
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s.write_fmt(format_args!("test")).unwrap();
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write!(stdout(), "test").unwrap();
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write!(stderr(), "test").unwrap();
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writeln!(stdout(), "test").unwrap();
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writeln!(stderr(), "test").unwrap();
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stdout().write_fmt(format_args!("test")).unwrap();
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stderr().write_fmt(format_args!("test")).unwrap();
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}
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// these should not warn, no unwrap
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{
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use std::io::Write;
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std::io::stdout().write_fmt(format_args!("test")).expect("no stdout");
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std::io::stderr().write_fmt(format_args!("test")).expect("no stderr");
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}
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}
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