mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-24 21:53:23 +00:00
95 lines
2.6 KiB
Rust
95 lines
2.6 KiB
Rust
// run-rustfix
|
||
|
||
#![allow(
|
||
clippy::print_literal,
|
||
clippy::redundant_clone,
|
||
clippy::to_string_in_format_args,
|
||
clippy::needless_borrow
|
||
)]
|
||
#![warn(clippy::useless_format)]
|
||
|
||
struct Foo(pub String);
|
||
|
||
macro_rules! foo {
|
||
($($t:tt)*) => (Foo(format!($($t)*)))
|
||
}
|
||
|
||
fn main() {
|
||
format!("foo");
|
||
format!("{{}}");
|
||
format!("{{}} abc {{}}");
|
||
format!(
|
||
r##"foo {{}}
|
||
" bar"##
|
||
);
|
||
|
||
let _ = format!("");
|
||
|
||
format!("{}", "foo");
|
||
format!("{:?}", "foo"); // Don't warn about `Debug`.
|
||
format!("{:8}", "foo");
|
||
format!("{:width$}", "foo", width = 8);
|
||
format!("{:+}", "foo"); // Warn when the format makes no difference.
|
||
format!("{:<}", "foo"); // Warn when the format makes no difference.
|
||
format!("foo {}", "bar");
|
||
format!("{} bar", "foo");
|
||
|
||
let arg: String = "".to_owned();
|
||
format!("{}", arg);
|
||
format!("{:?}", arg); // Don't warn about debug.
|
||
format!("{:8}", arg);
|
||
format!("{:width$}", arg, width = 8);
|
||
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 issue #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");
|
||
|
||
// Precision on string means slicing without panicking on size.
|
||
format!("{:.1}", "foo"); // Could be `"foo"[..1]`
|
||
format!("{:.10}", "foo"); // Could not be `"foo"[..10]`
|
||
format!("{:.prec$}", "foo", prec = 1);
|
||
format!("{:.prec$}", "foo", prec = 10);
|
||
|
||
format!("{}", 42.to_string());
|
||
let x = std::path::PathBuf::from("/bar/foo/qux");
|
||
format!("{}", x.display().to_string());
|
||
|
||
// False positive
|
||
let a = "foo".to_string();
|
||
let _ = Some(format!("{}", a + "bar"));
|
||
|
||
// Wrap it with braces
|
||
let v: Vec<String> = vec!["foo".to_string(), "bar".to_string()];
|
||
let _s: String = format!("{}", &*v.join("\n"));
|
||
|
||
format!("prepend {:+}", "s");
|
||
|
||
// Issue #8290
|
||
let x = "foo";
|
||
let _ = format!("{x}");
|
||
let _ = format!("{x:?}"); // Don't lint on debug
|
||
let _ = format!("{y}", y = x);
|
||
|
||
// Issue #9234
|
||
let abc = "abc";
|
||
let _ = format!("{abc}");
|
||
let xx = "xx";
|
||
let _ = format!("{xx}");
|
||
}
|