| // Demonstrates and records a theoretical regressions / breaking changes caused by the |
| // introduction of async trait bounds. |
| |
| // Setting the edition to 2018 since we don't regress `demo! { dyn async }` in Rust <2018. |
| //@ edition:2018 |
| |
| macro_rules! demo { |
| ($ty:ty) => { compile_error!("ty"); }; |
| //~^ ERROR ty |
| //~| ERROR ty |
| (impl $c:ident Trait) => {}; |
| (dyn $c:ident Trait) => {}; |
| } |
| |
| demo! { impl async Trait } |
| //~^ ERROR async closures are unstable |
| |
| demo! { dyn async Trait } |
| //~^ ERROR async closures are unstable |
| |
| fn main() {} |
