warning: unused extern crate
  --> $DIR/removing-extern-crate.rs:8:1
   |
LL | extern crate dummy_crate as foo;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unused
   |
note: the lint level is defined here
  --> $DIR/removing-extern-crate.rs:6:9
   |
LL | #![warn(rust_2018_idioms)]
   |         ^^^^^^^^^^^^^^^^
   = note: `#[warn(unused_extern_crates)]` implied by `#[warn(rust_2018_idioms)]`
help: remove the unused `extern crate`
   |
LL - extern crate dummy_crate as foo;
LL +
   |

warning: unused extern crate
  --> $DIR/removing-extern-crate.rs:9:1
   |
LL | extern crate core;
   | ^^^^^^^^^^^^^^^^^^ unused
   |
help: remove the unused `extern crate`
   |
LL - extern crate core;
LL +
   |

warning: unused extern crate
  --> $DIR/removing-extern-crate.rs:12:5
   |
LL |     extern crate dummy_crate as foo;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unused
   |
help: remove the unused `extern crate`
   |
LL -     extern crate dummy_crate as foo;
LL +
   |

warning: unused extern crate
  --> $DIR/removing-extern-crate.rs:13:5
   |
LL |     extern crate core;
   |     ^^^^^^^^^^^^^^^^^^ unused
   |
help: remove the unused `extern crate`
   |
LL -     extern crate core;
LL +
   |

warning: 4 warnings emitted