mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-12-22 19:13:29 +00:00
70 lines
2 KiB
Rust
70 lines
2 KiB
Rust
// run-rustfix
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#![allow(clippy::print_literal)]
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#![warn(clippy::useless_format)]
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struct Foo(pub String);
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macro_rules! foo {
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($($t:tt)*) => (Foo(format!($($t)*)))
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}
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fn main() {
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format!("foo");
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format!("{{}}");
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format!("{{}} abc {{}}");
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format!(
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r##"foo {{}}
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" bar"##
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);
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format!("{}", "foo");
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format!("{:?}", "foo"); // Don't warn about `Debug`.
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format!("{:8}", "foo");
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format!("{:width$}", "foo", width = 8);
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format!("{:+}", "foo"); // Warn when the format makes no difference.
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format!("{:<}", "foo"); // Warn when the format makes no difference.
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format!("foo {}", "bar");
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format!("{} bar", "foo");
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let arg: String = "".to_owned();
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format!("{}", arg);
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format!("{:?}", arg); // Don't warn about debug.
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format!("{:8}", arg);
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format!("{:width$}", arg, width = 8);
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format!("{:+}", arg); // Warn when the format makes no difference.
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format!("{:<}", arg); // Warn when the format makes no difference.
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format!("foo {}", arg);
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format!("{} bar", arg);
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// We don’t want to warn for non-string args; see issue #697.
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format!("{}", 42);
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format!("{:?}", 42);
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format!("{:+}", 42);
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format!("foo {}", 42);
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format!("{} bar", 42);
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// We only want to warn about `format!` itself.
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println!("foo");
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println!("{}", "foo");
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println!("foo {}", "foo");
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println!("{}", 42);
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println!("foo {}", 42);
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// A `format!` inside a macro should not trigger a warning.
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foo!("should not warn");
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// Precision on string means slicing without panicking on size.
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format!("{:.1}", "foo"); // Could be `"foo"[..1]`
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format!("{:.10}", "foo"); // Could not be `"foo"[..10]`
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format!("{:.prec$}", "foo", prec = 1);
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format!("{:.prec$}", "foo", prec = 10);
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format!("{}", 42.to_string());
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let x = std::path::PathBuf::from("/bar/foo/qux");
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format!("{}", x.display().to_string());
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// False positive
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let a = "foo".to_string();
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let _ = Some(format!("{}", a + "bar"));
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}
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