fn main() { println!("Test", 123, 456, 789); //~^ ERROR multiple unused formatting arguments println!("Test2", 123, //~ ERROR multiple unused formatting arguments 456, 789 ); println!("Some stuff", UNUSED="args"); //~ ERROR named argument never used println!("Some more $STUFF", "woo!", //~ ERROR multiple unused formatting arguments STUFF= "things" , UNUSED="args"); }