2 let _ = format!(concat!("{0}π³πΎππ{"), i);
3 //~^ ERROR: invalid format string: expected `'}'` but string was terminated
4 //~| NOTE: if you intended to print `{`, you can escape it using `{{`
5 //~| NOTE: in this expansion of concat!
6 //~| NOTE: in this expansion of concat!
7 //~| NOTE: expected `'}'` in format string