warning: unused extern crate --> $DIR/remove-extern-crate.rs:11:1 | LL | extern crate core; | ^^^^^^^^^^^^^^^^^^ help: remove it | note: the lint level is defined here --> $DIR/remove-extern-crate.rs:7:9 | LL | #![warn(rust_2018_idioms)] | ^^^^^^^^^^^^^^^^ = note: `#[warn(unused_extern_crates)]` implied by `#[warn(rust_2018_idioms)]` warning: `extern crate` is not idiomatic in the new edition --> $DIR/remove-extern-crate.rs:35:5 | LL | extern crate core; | ^^^^^^^^^^^^^^^^^^ | help: convert it to a `use` | LL | use core; | ~~~ warning: `extern crate` is not idiomatic in the new edition --> $DIR/remove-extern-crate.rs:45:5 | LL | pub extern crate core; | ^^^^^^^^^^^^^^^^^^^^^^ | help: convert it to a `use` | LL | pub use core; | ~~~ warning: 3 warnings emitted