error: `async` is a keyword in the 2018 edition --> $DIR/async-ident-allowed.rs:9:9 | LL | let async = 3; | ^^^^^ help: you can use a raw identifier to stay compatible: `r#async` | = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018! = note: for more information, see issue #49716 note: the lint level is defined here --> $DIR/async-ident-allowed.rs:3:9 | LL | #![deny(rust_2018_compatibility)] | ^^^^^^^^^^^^^^^^^^^^^^^ = note: `#[deny(keyword_idents)]` implied by `#[deny(rust_2018_compatibility)]` error: aborting due to previous error