error[E0706]: functions in traits cannot be declared `async`
  --> $DIR/feature-gate-async_fn_in_trait.rs:8:5
   |
LL |     async fn foo();
   |     -----^^^^^^^^^^
   |     |
   |     `async` because of this
   |
   = note: `async` trait functions are not currently supported
   = note: consider using the `async-trait` crate: https://crates.io/crates/async-trait
   = note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
   = help: add `#![feature(async_fn_in_trait)]` to the crate attributes to enable

error[E0706]: functions in traits cannot be declared `async`
  --> $DIR/feature-gate-async_fn_in_trait.rs:14:5
   |
LL |     async fn foo() -> impl Sized;
   |     -----^^^^^^^^^^^^^^^^^^^^^^^^
   |     |
   |     `async` because of this
   |
   = note: `async` trait functions are not currently supported
   = note: consider using the `async-trait` crate: https://crates.io/crates/async-trait
   = note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
   = help: add `#![feature(async_fn_in_trait)]` to the crate attributes to enable

error[E0706]: functions in traits cannot be declared `async`
  --> $DIR/feature-gate-async_fn_in_trait.rs:22:5
   |
LL |     async fn foo() {}
   |     -----^^^^^^^^^
   |     |
   |     `async` because of this
   |
   = note: `async` trait functions are not currently supported
   = note: consider using the `async-trait` crate: https://crates.io/crates/async-trait
   = note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
   = help: add `#![feature(async_fn_in_trait)]` to the crate attributes to enable

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0706`.