error: expected identifier, found `1` --> $DIR/issue-79099.rs:3:65 | LL | let f: impl core::future::Future = async { 1 }; | ----- ^ expected identifier | | | `async` blocks are only allowed in Rust 2018 or later | = help: pass `--edition 2021` 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 = async { 1 }; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `impl Trait` is only allowed in arguments and return types of functions and methods error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0562`.