error: `dyn` is a keyword in the 2018 edition --> $DIR/dyn-keyword.rs:8:9 | LL | let dyn = (); | ^^^ help: you can use a raw identifier to stay compatible: `r#dyn` | = 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/dyn-keyword.rs:5:9 | LL | #![deny(keyword_idents)] | ^^^^^^^^^^^^^^ error: aborting due to 1 previous error