error: argument never used --> $DIR/issue-92267.rs:3:34 | LL | pub fn main() { println!("🦀%%%", 0) } | ^ argument never used | note: format specifiers use curly braces, and the conversion specifier ` ` is unknown or unsupported --> $DIR/issue-92267.rs:3:30 | LL | pub fn main() { println!("🦀%%%", 0) } | ^^ = note: printf formatting is not supported; see the documentation for `std::fmt` error: aborting due to previous error