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