rust/tests/ui/async-await/async-fn/macro-async-trait-bound-theoretical-regression.rs
Josh Triplett 131cffb6ba Rename tests named with mbe to use macro instead
Most macro tests use `macro` in the name, making it easy to find and run
tests relevant to macros. However, a few use `mbe` instead. Rename those
to say `macro`.
2025-07-05 21:09:10 -07:00

22 lines
561 B
Rust

// 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` trait bounds are unstable
demo! { dyn async Trait }
//~^ ERROR `async` trait bounds are unstable
fn main() {}