mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-10 15:14:29 +00:00
47 lines
1.3 KiB
Rust
47 lines
1.3 KiB
Rust
|
||
#![allow(print_literal)]
|
||
#![warn(useless_format)]
|
||
|
||
struct Foo(pub String);
|
||
|
||
macro_rules! foo {
|
||
($($t:tt)*) => (Foo(format!($($t)*)))
|
||
}
|
||
|
||
fn main() {
|
||
format!("foo");
|
||
|
||
format!("{}", "foo");
|
||
format!("{:?}", "foo"); // don't warn about debug
|
||
format!("{:8}", "foo");
|
||
format!("{:+}", "foo"); // warn when the format makes no difference
|
||
format!("{:<}", "foo"); // warn when the format makes no difference
|
||
format!("foo {}", "bar");
|
||
format!("{} bar", "foo");
|
||
|
||
let arg: String = "".to_owned();
|
||
format!("{}", arg);
|
||
format!("{:?}", arg); // don't warn about debug
|
||
format!("{:8}", arg);
|
||
format!("{:+}", arg); // warn when the format makes no difference
|
||
format!("{:<}", arg); // warn when the format makes no difference
|
||
format!("foo {}", arg);
|
||
format!("{} bar", arg);
|
||
|
||
// we don’t want to warn for non-string args, see #697
|
||
format!("{}", 42);
|
||
format!("{:?}", 42);
|
||
format!("{:+}", 42);
|
||
format!("foo {}", 42);
|
||
format!("{} bar", 42);
|
||
|
||
// we only want to warn about `format!` itself
|
||
println!("foo");
|
||
println!("{}", "foo");
|
||
println!("foo {}", "foo");
|
||
println!("{}", 42);
|
||
println!("foo {}", 42);
|
||
|
||
// A format! inside a macro should not trigger a warning
|
||
foo!("should not warn");
|
||
}
|