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// Demonstrates and records a theoretical regressions / breaking changes caused by the
// introduction of async trait bounds.
// Setting the edition to >2015 since we didn't regress `demo! { dyn async }` in Rust 2015.
//@ edition:2018
macro_rules! demo {
($ty:ty) => { compile_error!("ty"); }; // KEEP THIS RULE FIRST AND AS IS!
//~^ ERROR ty
//~| ERROR ty
// DON'T MODIFY THE MATCHERS BELOW UNLESS THE ASYNC TRAIT MODIFIER SYNTAX CHANGES!
(impl $c:ident Trait) => { /* KEEP THIS EMPTY! */ };
(dyn $c:ident Trait) => { /* KEEP THIS EMPTY! */ };
}
demo! { impl async Trait } //~ ERROR `async` trait bounds are unstable
demo! { dyn async Trait } //~ ERROR `async` trait bounds are unstable
fn main() {}
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