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-rw-r--r-- | src/tools/clippy/src/docs/unused_format_specs.txt | 24 |
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diff --git a/src/tools/clippy/src/docs/unused_format_specs.txt b/src/tools/clippy/src/docs/unused_format_specs.txt new file mode 100644 index 000000000..77be3a2fb --- /dev/null +++ b/src/tools/clippy/src/docs/unused_format_specs.txt @@ -0,0 +1,24 @@ +### What it does +Detects [formatting parameters] that have no effect on the output of +`format!()`, `println!()` or similar macros. + +### Why is this bad? +Shorter format specifiers are easier to read, it may also indicate that +an expected formatting operation such as adding padding isn't happening. + +### Example +``` +println!("{:.}", 1.0); + +println!("not padded: {:5}", format_args!("...")); +``` +Use instead: +``` +println!("{}", 1.0); + +println!("not padded: {}", format_args!("...")); +// OR +println!("padded: {:5}", format!("...")); +``` + +[formatting parameters]: https://doc.rust-lang.org/std/fmt/index.html#formatting-parameters
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