mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-09-20 14:41:58 +00:00
92 lines
2.3 KiB
Rust
92 lines
2.3 KiB
Rust
#![warn(clippy::useless_format)]
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#![allow(
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clippy::print_literal,
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clippy::redundant_clone,
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clippy::to_string_in_format_args,
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clippy::needless_borrow,
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clippy::uninlined_format_args,
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clippy::needless_raw_string_hashes,
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clippy::useless_vec
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)]
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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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let _ = format!("");
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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$}", "foo", width = 8);
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format!("foo {}", "bar");
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format!("{} bar", "foo");
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let arg = String::new();
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format!("{}", arg);
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format!("{:?}", arg); // Don't warn about debug.
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format!("{:8}", arg);
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format!("{:width$}", arg, width = 8);
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format!("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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// Wrap it with braces
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let v: Vec<String> = vec!["foo".to_string(), "bar".to_string()];
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let _s: String = format!("{}", &*v.join("\n"));
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format!("prepend {:+}", "s");
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// Issue #8290
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let x = "foo";
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let _ = format!("{x}");
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let _ = format!("{x:?}"); // Don't lint on debug
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let _ = format!("{y}", y = x);
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// Issue #9234
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let abc = "abc";
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let _ = format!("{abc}");
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let xx = "xx";
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let _ = format!("{xx}");
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}
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