1 #![feature(rustc_attrs)]
2 
3 macro_rules! check {
4     ($expr: expr) => (
5         #[rustc_dummy = $expr]
6         use main as _;
7     );
8 }
9 
10 check!("0"); // OK
11 check!(0); // OK
12 check!(0u8); //~ ERROR suffixed literals are not allowed in attributes
13 check!(-0); //~ ERROR unexpected token: `-0`
14 check!(0 + 0); //~ ERROR unexpected token: `0 + 0`
15 
main()16 fn main() {}
17