error[E0422]: cannot find struct, variant or union type `async` in this scope
  --> $DIR/feature-gate-async-await-2015-edition.rs:18:13
   |
LL |     let _ = async {}; //~ ERROR cannot find struct, variant or union type `async`
   |             ^^^^^ not found in this scope

error[E0425]: cannot find value `async` in this scope
  --> $DIR/feature-gate-async-await-2015-edition.rs:19:13
   |
LL |     let _ = async || {}; //~ ERROR cannot find value `async` in this scope
   |             ^^^^^ not found in this scope

error[E0658]: async fn is unstable (see issue #50547)
  --> $DIR/feature-gate-async-await-2015-edition.rs:15:1
   |
LL | async fn foo() {} //~ ERROR async fn is unstable
   | ^^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(async_await)] to the crate attributes to enable

error: aborting due to 3 previous errors

Some errors occurred: E0422, E0425, E0658.
For more information about an error, try `rustc --explain E0422`.