1 error[E0658]: `await!(<expr>)` macro syntax is unstable, and will soon be removed in favor of `<expr>.await` syntax.
2 --> $DIR/await-macro.rs:9:5
7 = note: for more information, see https://github.com/rust-lang/rust/issues/50547
8 = help: add #![feature(await_macro)] to the crate attributes to enable
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0658`.