error: expected identifier, found `1`
  --> $DIR/issue-79099.rs:3:65
   |
LL |         let f: impl core::future::Future<Output = u8> = async { 1 };
   |                                                         -----   ^ expected identifier
   |                                                         |
   |                                                         `async` blocks are only allowed in Rust 2018 or later
   |
   = help: pass `--edition 2024` to `rustc`
   = note: for more on editions, read https://doc.rust-lang.org/edition-guide

error[E0562]: `impl Trait` is not allowed in the type of variable bindings
  --> $DIR/issue-79099.rs:3:16
   |
LL |         let f: impl core::future::Future<Output = u8> = async { 1 };
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `impl Trait` is only allowed in arguments and return types of functions and methods
   = note: see issue #63065 <https://github.com/rust-lang/rust/issues/63065> for more information
   = help: add `#![feature(impl_trait_in_bindings)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0562`.