#![allow(dead_code)] fn bar<'a>(_: std::fmt::Arguments<'a>) {} fn main() { let x = format_args!("a {} {} {}.", 1, format_args!("b{}!", 2), 3); //~^ ERROR temporary value dropped while borrowed bar(x); let foo = format_args!("{}", "hi"); //~^ ERROR temporary value dropped while borrowed bar(foo); let foo = format_args!("hi"); // no placeholder in arguments, so no error bar(foo); }