tests/ui/feature-gates/feature-gate-concat_idents.rs

   1 const XY_1: i32 = 10;
   2
   3 fn main() {
   4     const XY_2: i32 = 20;
   5     let a = concat_idents!(X, Y_1); //~ ERROR `concat_idents` is not stable
   6     let b = concat_idents!(X, Y_2); //~ ERROR `concat_idents` is not stable
   7     assert_eq!(a, 10);
   8     assert_eq!(b, 20);
   9 }