gistfile1.txt

error[E0601]: `main` function not found in crate `test2`
 --> /home/michael/test2.rs:1:1
  |
1 | / fn foo() -> impl std::future::Future<Output = ()> {
2 | |     async { 1usize }
3 | | }
  | |_^ consider adding a `main` function to `/home/michael/test2.rs`

error[E0271]: type mismatch resolving `<impl Future<Output = <[static generator@/home/michael/test2.rs:2:11: 2:21] as Generator<ResumeTy>>::Return> as Future>::Output == ()`
 --> /home/michael/test2.rs:1:13
  |
1 | fn foo() -> impl std::future::Future<Output = ()> {
  |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found `usize`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0271, E0601.
For more information about an error, try `rustc --explain E0271`.