#![warn(clippy::unused_format_specs)] #![allow(unused)] macro_rules! format_args_from_macro { () => { format_args!("from macro") }; } fn main() { // prints `.`, not ` .` println!("{:5}.", format_args!("")); //~^ ERROR: format specifiers have no effect on `format_args!()` //~| NOTE: `-D clippy::unused-format-specs` implied by `-D warnings` //prints `abcde`, not `abc` println!("{:.3}", format_args!("abcde")); //~^ ERROR: format specifiers have no effect on `format_args!()` println!("{:5}.", format_args_from_macro!()); //~^ ERROR: format specifiers have no effect on `format_args!()` let args = format_args!(""); println!("{args:5}"); //~^ ERROR: format specifiers have no effect on `format_args!()` } fn should_not_lint() { println!("{}", format_args!("")); // Technically the same as `{}`, but the `format_args` docs specifically mention that you can use // debug formatting so allow it println!("{:?}", format_args!("")); let args = format_args!(""); println!("{args}"); }