error[E0658]: `async` blocks are not allowed in constants --> $DIR/issue-78722.rs:13:20 | LL | let f: F = async { 1 }; | ^^^^^^^^^^^ | = note: see issue #85368 for more information = help: add `#![feature(const_async_blocks)]` to the crate attributes to enable error[E0493]: destructors cannot be evaluated at compile-time --> $DIR/issue-78722.rs:13:13 | LL | let f: F = async { 1 }; | ^ constants cannot evaluate destructors ... LL | }], | - value is dropped here error[E0271]: expected `impl Future` to be a future that resolves to `u8`, but it resolves to `()` --> $DIR/issue-78722.rs:9:30 | LL | fn concrete_use() -> F { | ^ expected `()`, found `u8` error: aborting due to 3 previous errors Some errors have detailed explanations: E0271, E0493, E0658. For more information about an error, try `rustc --explain E0271`.