Independent of what rustc does today, which output would you *want* the following program to print?

macro_rules! stringify_expr {
($expr:expr) => {
stringify!($expr)
};
}

macro_rules! stringify_if_eq {
($expr:expr) => {
stringify_expr!(if $expr == $expr {})
};
}

fn main() {
println!("{}", stringify_if_eq!(Struct {}));
}

When voting for the option without parens, bear in mind that is not valid Rust syntax. If the pretty-printer behaves that way, it means for example `cargo rustc -- -Zunpretty=expanded` (i.e. cargo expand) would produce output that cannot be parsed by rustfmt.